airstream_李宁airstream

airstream_李宁airstream

       下面，我将用我自己的方式来解释airstream的问题，希望我的回答能够对大家有所帮助。让我们开始讨论一下airstream的话题。

1.国际音标的发音规则（用英语解释）

2.爆改废弃交通工具，这7家创意酒店，每一个都让人惊艳

3.直升机的英文介绍

4.世界顶级十大豪华房车

国际音标的发音规则（用英语解释）

       /p/and/b/ You pronounce the/p/and/b/ by stopping the airstream with your lips,building up pressure and suddenly releasing the air.

        /k/and/g/ You produce /k/and/g/by blocking the breath-stream with the back of the tongue and soft palate,building up the the pressure,and suddenly releasing it.

        /f/and/v/ are labio-dental sounds./f/ is voiceless and /v/ is voiced.They are fricative sounds that are produced by forcing the breathstream between your upper teeth and lower lip.

        /θ/and/?/ are interdental sounds.These fricatives are produced by squeezing the breathstream between your tongues and teeth./θ/is voiceless and /?/ is voiced.

        /s/and/z/ are alveolar sounds.These fricatives are produced by forcing air between the tongue and upper or lower front teeth./s/is voiceless and /z/ is voiced.

        /h/is a voiceless glottal fricative.It is simply a stream of air from the larynx directed through the open mouth.

        这些音标我不会打呵呵,你自己查看看,我用单词替代,不好意思嘎

        should and /3/are lingua-palata fricatives.They are produced in much the same way as the /s/ and /z/,except the tongue is farther back and the lips are rounded.

        /tf/ and /d3/ are affricate sounds,produced by blocking off the breath-stream between the tongue and gum ridge,for a stop and a fricative.

        /m/andn/ are simple,straight-forward consonants:the /m/ occurs at the front of the mouth and is grouped with the labials,the /n/ is produced on the upper gum ridge and is alveolar.The place of articulation of /?/ is the same as that of /k/and/g/.It is made with the back of the tongue touching the soft palate.

        /w/ and /j/ are similar in several ways.First,they are closely ralated to a vowel sound:/j/ is similar to the vowel /i:/ and /w/ is very much like the vowel /u:/.Second,they are both voiced consonants.In pronunciation,for /j/ the lips are relaxed and the tongue is in the highn front space;for/w/the lips are rounded and the tongue is in the hing back space.Then there is a movement away from these positions to whatever sound follows.

        /r/ is the other approximant besides /j/ and /w/ in English.The important thing about the articulation of /r/ ia that the tip of the tongue approaches the alveolar area in approximately the way it would for a /t/ or /d/,but never actually makes contact with any part of the roof of the mouth.During the pronunciation,the tongue is in fact usually slightly curled backwards with the tip raised.

        /l/The fact that the /l/ phoneme is typically produced with potential air flow around one or both sides of the tongue makes it unique among English speech sounds.It is also highly variable in terms of its articulation.Several important variations exist.In pronunciation,you produce it by dropping the sides of the tongue and allowing air to escape around the sides.

        /i:/and/i/ /i:/ is made by raising the body of the tongue from its rest position and shifting it forward.The /i/ sound is made by lowering the tongue slightly froom the high-front position for /i:/.Also,/i:/ is a much more tense sound than /i/.The fact that English has these two high front vowles,differentiated by muscle tension in the root of the tongue,sets it apart from Chinese and many languages of the world.

        /e/ and /?/ /e/ the tongue body is shifted forward in the mid-place./?/ is produced by shifting the body of the tongue forward from its relaxed state,and lowering it from the position for /e/.It is the lowest of the front vowels.

        /?:/ and /?/ are central vowels./?:/ is made with the tongue around the middle of the mouth.It occurs only in stressed syllables./?/ is also called a schwa.It is made similarly to /?:/,but with less tension.

        /u:/and /u/ are both high,back,rounded vowels.The /u:/ marks the highest boundary for the back vowels,as /i:/ does for the front vowels.Therefore,the tongue is retracted from its rest position and toward the soft palate.Along with/u:/,/u/ pletes the vowels in the high back space on the vowels chart.Its corresponding front vowes is /i/.When making the sound,the tongue is retracted as for /u:/ but not elevated to the same extent.In addition,the/u/vowle is not made tith as much tension in the root of the tongue as /u:/.

        /o:/is amid-back vowel.For its production,the tongue is retracted and almost flat in the mouth.The vowel is almost fully back and has quite strong lip-rounding./o/is a low vowel.The lips are slightly rounded.

        /a:/ and /a/ The /a:/ is made by lowering and flattening the tongue in the oral cavity.It is a low vowel,but not as far back as other back vowels in English./a/ is quite different from other vowels in this group in that it is more like a central vowel than a back vowel./a/ is made with the tongue around the approximate middle of the mouth,but shifted slightly back.It is lower than the other central vowels /?:/ and /?/.The lip position is nertral.

        /i?/,/e?/ and /u?/ are called centring diphthongs because they all glide towards /?/,as the symbols indicate.The starting point for /i?/ is a little closer than /i/ in bit,bin./e?/ begins with the similar vowel sound as the /e/ of get,men./u?/ has a starting point slightly closer than /u/ in put,pull.

        /ei/,/ai/ and /oi/ are three diphthongs that glide towards/i/./ei/ begins with the same vowel sound as the /e/ of get,men./ai/ begins with an open vowel which is betwwen front and back;it is quite similar to the /a/ in the words like cut,bun.The starting point of /oi/ is a little more open than /o:/ in ought,born.The closing diphthongs have the characteristic that they all end with a glide towards a closer vowel.Because the second part of the diphthong is weak,they often do ont reach a position that could be called close.The important thing is that a glide from a relatively more open towards a relatively more close vowel is prduced.

        /?u/ and /au/ are the two diphthongs that end with a glide towards /u/.So as the tongue moves closer to the roof of the mouth there is at the same time a rounding movement of the lips.

爆改废弃交通工具，这7家创意酒店，每一个都让人惊艳

       beam, bream, cream, deem, deme, gleam, mime, neem, Nimes, ream, scheme, scream, abeam, agleam, airstream, berseem, beseem, bireme, blaspheme, bloodstream, centime, daydream, downstream, esteem, extreme, grapheme, Gulf Stream, hakim, headstream, hornbeam, ice cream, inseam, kilim, lexeme, mainstream, midstream, millime, millstream, moonbeam, morpheme, onstream, phoneme, redeem, regime, sememe, sidestream, slipstream, sunbeam, supreme, Tarim, taxeme, toneme, trireme, unseam, upstream

       mime, prime, rhyme, rime, slime, stime, thyme, time

       airtime, all-time, bedtime, begrime, big time, birdlime, daytime, downtime, dreamtime, enzyme, flextime, foretime, halftime, lifetime, longtime, lunchtime, Mannheim, Maytime, mealtime, meantime, nighttime, noontime, old-time, onetime, part-time, pastime, peacetime, playtime, quicklime, ragtime, schooltime, seedtime, smalltime, sometime, space-time, springtime, sublime, teatime, two-time, uptime, wartime

直升机的英文介绍

       汽车 、火车、飞机等交通工具的出现，帮助了人类实现空间转移的伟大进步，给每位旅行者带来极大的便利。 旅游 交通是完成 旅游 活动的先决条件，也是发展 旅游 业的命脉。

        当这些昔日的“老伙计”走完汹涌澎湃的一生后该何去何从？它们该以何种方式再度吸引旅行者的目光？本期我整理了全球由废弃交通工具改造成的创意酒店，带大家一起体验住宿不一样的视角！

        美国德克萨斯州温伯利小镇有一家迪克西黛西露营地（Dixie Daisy），坐落在史密斯溪河畔的榆树林中，环境清幽，空气清新。

        房车经过了翻修，内部鹅黄的色调明亮欢快，碎花的窗帘营造了复古可爱的气息。房车生活设置齐全，内置双人床，电视、无线网络，厨房配备了餐具和器皿。

        早晨品尝新鲜的鸡蛋和有机咖啡，白天沿着清澈的小溪边散步，或去附近的古朴城市和酿酒厂参观，玩累了躺在五彩斑斓的吊床上与大自然一起睡个酣甜的午觉。

        夜幕降临，一串串灯火点亮心情。在微凉的深秋篝火旁烤火，在月光下的热水浴池里泡澡，宽阔的私人户外淋浴间可以让你放松身心，洗澡不再是急急冲刷，而是可以哼着小歌。这些细节才是旅行中体验生活的关键。

        同样，在加利福尼亚州洛杉矶西南部的马里布，也有一处独一无二的度假胜地，这里坐拥太平洋迷人的海岸线和圣莫尼卡群山的峡谷风光。

        民宿使用的房车是北美 历史 最悠久的房车制造商Airstream，内部经过重新装修宽敞舒适，安置了一张大床和一张可折叠的沙发床，以及一个小厨房，可居住3人。

        这里逃离繁华的市中心，周围环绕着原始的自然风光和野生动物，坐拥无限的海景，你可以观赏到最美的日出日落，还有可能与清晨觅食的小野鹿偶遇。

        还记得英国侦探小说家阿加莎·克里斯蒂的《东方快车谋杀案》吗？还记得影视作品中的列车处处散发奢华和优雅吗？被誉为“世界豪华传奇列车” 的威尼斯辛普隆东方快车，以舒适和豪华而享有盛名。从1883年投入运营至1977年停运，经历了百年传奇。

        这座 “车轮上的宫殿” 内饰极尽奢华，列车中最棒的部分是3674 酒吧，内部装潢灵感来自经典的侍者制服及精致的镶嵌装饰，以活泼明亮的蓝色和金色作为主调，酒吧24小时不打烊。

        车厢内设有三种房型：单人客房、双人客房以及双人豪华套房，高级的抛光木材，搭配上了温暖的绒布图腾，再加上华丽的室内装饰与古董摆饰，仿佛带着旅客们重新回味了欧洲古典年代的优雅与魅力。

        百年间，这趟列车载满了王公贵族和显赫人物，包括爱因斯坦、海明威和伊丽莎白女王。现如今，各大奢侈品广告主争先恐后的借黄金时代最传奇的列车汲取灵感。

        从巴黎开往伊斯坦布尔的东方快车上，香奈儿N 5香水女神奥黛丽·塔图演绎了一段午夜列车的浪漫邂逅，在复古色调的镜头下极致迷人。

        在非洲大陆的南端， 每天都有着五列古董全木结构的豪华火车行驶在广袤的荒原之中，而他们有一个共同的名字 “非洲之傲” 。

        非洲之傲列车是由英裔南非富商罗罕·沃斯于1986年创办的列车公司。车厢内主要是维多利亚风格的套房，配有地板加热、空调、冰箱、保险柜、以及全套卫浴设施，每节车厢最多只能安排3个豪华套房。因此，一列火车最多只能搭乘72名乘客。

        非洲之傲被欧洲贵族称为 “铁轨上的邮轮” 和 “流动的五星级酒店” ，是无数人关于旅行的梦想。游客可以在飞驰的列车上，躺在浴缸内欣赏窗外一望无际的草原和美妙的落日。

        非洲之傲提供2到14天不等的行车线路，用极致奢华的旅行方式为游客们提供优雅与冒险同行的火车之旅。

        一路途径若干个南非国家级野生动物公园，近距离观赏犀牛、大象、长颈鹿、狮子等野生动物，一路向北可观赏到 “世界三大瀑布” 之一的维多利亚瀑布。

        想去邮轮但又怕晕船？ 韩国太阳邮轮度假村可能是你的答案。位于江原道江陵市有一艘巨型邮轮，它不在海里，而是 “搁浅” 在海拔60米的悬崖上。因奇特的造型曾被CNN评定为 “世界最神奇的12家酒店” 之一。

        度假村自称为 “陆地上第一艘豪华邮轮” ，所有布置按照真实邮轮一比一打造，你可以在豪华邮轮上体验到一切——除了晕船。甚至还有一个旋转的天空休闲大厅，每小时旋转一次，可以俯瞰大海。

        2001年12月开始营业的Sun Cruise所有客房全部面向正东津大海，拥有套房、标间共计211间客房，分为酒店式和公寓式两种。

        健身房、 娱乐 会所、无边泳池、私人沙滩、360度景观餐厅，云端旋转酒吧一应俱全。海边的玻璃眺望台可以近距离观赏日出日落的美景。

        英国Oliver’s Travels 是一家专门为富人定制服务的 旅游 公司，2014年情人节开始，该公司推出了Mile Low俱乐部，俱乐部会员可以体验一艘由潜艇改装的豪华潜艇酒店，该酒店位于加勒比海内。

        潜艇内设有观景窗、沙发、电视、特大号床，酒吧……完全满足你的想象。酒店会为每位客人提供一位私人管家和服务员，并有专门的厨师为顾客烹饪最高级的食物，以确保客人能够得到全方位的个性化服务。

        客人可以选择将该潜艇悬浮在加勒比的任何海岸，也可以指定潜艇停留在加勒比海域深达200米的某个地方。完全不受空间限制，最适合试图“人间蒸发”，想要完全沉浸在二人世界里的情侣。

        一边乘坐潜艇，一边感受深海的魅力。当然想要私享这片静谧的海底可是要付出不菲的代价，这艘潜艇的价格大约为每晚175,000美金。

        在瑞典阿兰达机场附近，有一家用飞机改造的旅馆Jumbo Stay。其原身是一架1976年出厂的拥有450座的大型喷气式波音747-212B，2002年因其所效力的瑞典Transjet航空公司破产而退役。

        这架450座的大型喷气式飞机仅用了一年时间就华丽转身成为“喷气式飞机旅舍”。珍宝旅舍设有27间客房，共计76个床位。飞机底下的货舱、驾驶舱、机舱甚至飞机涡轮，都变成了客房。

        每间客房大小不一，包括四人间、单人间、标准间和豪华套房。每间客房还被贴心地配备上了卫生间、WiFi和平板电视。

        最受欢迎的客房要数由驾驶舱改装而成的豪华套房，客房内保留了驾驶舱的部分设备，躺在床上可以欣赏阿兰达机场附近的风景。

        在这个创意为王的时代，交通工具也可以不再仅仅是串联起点与终点的运输者，它们也能摇身一变成奢华酒店，成为目的地的网红地标，吸引着我们前行！打破固有思维，这些 旅游 改造创意你get到了吗？

        文章素材来源空间探秘及其他网络平台，由睿途旅创整理编辑，转载请注明出处。

世界顶级十大豪华房车

       How is a helicopter made?

       Background

       Helicopters are classified as rotary wing aircraft, and their rotary wing is commonly referred to as the main rotor or simply the rotor. Unlike the more common fixed wing aircraft such as a sport biplane or an airliner, the helicopter is capable of direct vertical take-off and landing; it can also hover in a fixed position. These features render it ideal for use where space is limited or where the ability to hover over a precise area is necessary. Currently, helicopters are used to dust crops, apply pesticide, access remote areas for environmental work, deliver supplies to workers on remote maritime oil rigs, take photographs, film movies, rescue people trapped in inaccessible spots, transport accident victims, and put out fires. Moreover, they have numerous intelligence and military applications.

       Numerous individuals have contributed to the conception and development of the helicopter. The idea appears to have been bionic in origin, meaning that it derived from an attempt to adapt a natural phenomena—in this case, the whirling, bifurcated fruit of the maple tree—to a mechanical design. Early efforts to imitate maple pods produced the whirligig, a children's toy popular in China as well as in medieval Europe. During the fifteenth century, Leonardo da Vinci, the renowned Italian painter, sculptor, architect, and engineer, sketched a flying machine that may have been based on the whirligig. The next surviving sketch of a helicopter dates from the early nineteenth century, when British scientist Sir George Cayley drew a twin-rotor aircraft in his notebook. During the early twentieth century, Frenchman Paul Cornu managed to lift himself off the ground for a few seconds in an early helicopter. However, Cornu was constrained by the same problems that would continue to plague all early designers for several decades: no one had yet devised an engine that could generate enough vertical thrust to lift both the helicopter and any significant load (including passengers) off the ground.

       Igor Sikorsky, a Russian engineer, built his first helicopter in 1909. When neither this prototype nor its 1910 successor succeeded, Sikorsky decided that he could not build a helicopter without more sophisticated materials and money, so he transferred his attention to aircraft. During World War I, Hungarian engineer Theodore von Karman constructed a helicopter that, when tethered, was able to hover for extended periods. Several years later, Spaniard Juan de la Cierva developed a machine he called an autogiro in response to the tendency of conventional airplanes to lose engine power and crash while landing. If he could design an aircraft in which lift and thrust (forward speed) were separate functions, Cierva speculated, he could circumvent this problem. The autogiro he subsequently invented incorporated features of both the helicopter and the airplane, although it resembled the latter more. The autogiro had a rotor that functioned something like a windmill. Once set in motion by taxiing on the ground, the rotor could generate supplemental lift; however, the autogiro was powered primarily by a conventional airplane engine. To avoid landing problems, the engine could be disconnected and the autogiro brought gently to rest by the rotor, which would gradually cease spinning as the machine reached the ground. Popular during the 1920s and 1930s, autogiros ceased to be produced after the refinement of the conventional helicopter.

       The helicopter was eventually perfected by Igor Sikorsky. Advances in aerodynamic theory and building materials had been made since Sikorsky's initial endeavor, and, in 1939, he lifted off the ground in his first operational helicopter. Two years later, an improved design enabled him to remain aloft for an hour and a half, setting a world record for sustained helicopter flight.

       The helicopter was put to military use almost immediately after its introduction. While it was not utilized extensively during World War II, the jungle terrain of both Korea and Vietnam prompted the helicopter's widespread use during both of those wars, and technological refinements made it a valuable tool during the Persian Gulf War as well. In recent years, however, private industry has probably accounted for the greatest increase in helicopter use, as many companies have begun to transport their executives via helicopter. In addition, helicopter shuttle services have proliferated, particularly along the urban corridor of the American Northeast. Still, among civilians the helicopter remains best known for its medical, rescue, and relief uses.

       Design

       A helicopter's power comes from either a piston engine or a gas turbine (recently, the latter has predominated), which moves the rotor shaft, causing the rotor to turn. While a standard plane generates thrust by pushing air behind its wing as it moves forward, the helicopter's rotor achieves lift by pushing the air beneath it downward as it spins. Lift is proportional to the change in the air's momentum (its mass times its velocity): the greater the momentum, the greater the lift.

       Helicopter rotor systems consist of between two and six blades attached to a central hub. Usually long and narrow, the blades turn relatively slowly, because this minimizes the amount of power necessary to achieve and maintain lift, and also because it makes controlling the vehicle easier. While light-weight, general-purpose helicopters often have a two-bladed main rotor, heavier craft may use a four-blade design or two separate main rotors to accommodate heavy loads.

       To steer a helicopter, the pilot must adjust the pitch of the blades, which can be set three ways. In the collective system, the pitch of all the blades attached to the rotor is identical; in the cyclic system, the pitch of each blade is designed to fluctuate as the rotor revolves, and the third system uses a combination of the first two. To move the helicopter in any direction, the pilot moves the lever that adjusts collective pitch and/or the stick that adjusts cyclic pitch; it may also be necessary to increase or reduce speed.

       Unlike airplanes, which are designed to minimize bulk and protuberances that would weigh the craft down and impede airflow around it, helicopters have unavoidably high drag. Thus, designers have not utilized the sort of retractable landing gear familiar to people who have watched planes taking off or landing—the aerodynamic gains of such a system would be proportionally insignificant for a helicopter. In general, helicopter landing gear is much simpler than that of airplanes. Whereas the latter require long runways on which to reduce forward velocity, helicopters have to reduce only vertical lift, which they can do by hovering prior to landing. Thus, they don't even require shock absorbers: their landing gear usually comprises only wheels or skids, or both.

       One problem associated with helicopter rotor blades occurs because airflow along the length of each blade differs widely. This means that lift and drag fluctuate for each blade throughout the rotational cycle, thereby exerting an unsteadying influence upon the helicopter. A related problem occurs because, as the helicopter moves forward, the lift beneath the blades that enter the airstream first is high, but that beneath the blades on the opposite side of the rotor is low. The net effect of these problems is to destabilize the helicopter. Typically, the means of compensating for these unpredictable variations in lift and drag is to manufacture flexible blades connected to the rotor by a hinge. This design allows each blade to shift up or down, adjusting to changes in lift and drag.

       Torque, another problem associated with the physics of a rotating wing, causes the helicopter fuselage (cabin) to rotate in the opposite direction from the rotor, especially when the helicopter is moving at low speeds or hovering. To offset this reaction, many helicopters use a tail rotor, an exposed blade or ducted fan mounted on the end of the tail boom typically seen on these craft. Another means of counteracting torque entails installing two rotors, attached to the same engine but rotating in opposite directions, while a third, more space-efficient design features twin rotors that are enmeshed, something like an egg beater. Additional alternatives have been researched, and at least one NOTAR (no tail rotor) design has been introduced.

       Raw Materials

       The airframe, or fundamental structure, of a helicopter can be made of either metal or organic composite materials, or some combination of the two. Higher performance requirements will incline the designer to favor composites with higher strength-to-weight ratio, often epoxy (a resin) reinforced with glass, aramid (a strong, flexible nylon fiber), or carbon fiber. Typically, a composite component consists of many layers of fiber-impregnated resins, bonded to form a smooth panel. Tubular and sheet metal substructures are usually made of aluminum, though stainless steel or titanium are sometimes used in areas subject to higher stress or heat. To facilitate bending during the manufacturing process, the structural tubing is often filled with molten sodium silicate. A helicopter's rotary wing blades are usually made of fiber-reinforced resin, which may be adhesively bonded with an external sheet metal layer to protect edges. The helicopter's windscreen and windows are formed of polycarbonate sheeting.

       The Manufacturing

       Process

       Airframe: Preparing the tubing

       Each individual tubular part is cut by a tube cutting machine that can be quickly set to produce different, precise lengths and specified batch quantities. Tubing requiring angular bends is shaped to the proper angle in a bending machine that utilizes interchangeable tools for different diameters and sizes. For other than minor bends, tubes are filled with molten sodium silicate that hardens and eliminates kinking by causing the tube to bend as a solid bar. The so-called water glass is then removed by placing thebent tube in boiling water, which melts the inner material. Tubing that must be curved to match fuselage contours is fitted over a stretch forming machine, which stretches the metal to a precisely contoured shape. Next, the tubular details are delivered to the machine shop where they are held in clamps so that their ends can be machined to the required angle and shape. The tubes are then deburred (a process in which any ridges or fins that remain after preliminary machining are ground off) and inspected for cracks.

       Gussets (reinforcing plates or brackets) and other reinforcing details of metal are machined from plate, angle, or extruded profile stock by routing, shearing, blanking, or sawing. Some critical or complex details may be forged or investment cast. The latter process entails injecting wax or an alloy with a low melting point into a mold or die. When the template has been formed, it is dipped in molten metal as many times as necessary to achieve the thickness desired. When the part has dried, it is heated so that the wax or alloy will melt and can be poured out. Heated to a higher temperature to purify it and placed in a mold box where it is supported by sand, the mold is then ready to shape molten metal into reinforcement parts. After removal and cooling, these parts are then finish-machined by standard methods before being deburred once again.

       The tubes are chemically cleaned, fitted into a subassembly fixture, and MIG (metal-arc inert gas) welded. In this process, a small electrode wire is fed through a welding torch, and an inert, shielding gas (usually argon or helium) is passed through a nozzle around it; the tubes are joined by the melting of the wire. After welding, the subassembly is stress relieved—heated to a low temperature so that the metal can recover any elasticity it has lost during the shaping process. Finally, the welds are inspected for flaws.

       Forming sheet metal details

       Sheet metal, which makes up other parts of the airframe, is first cut into blanks (pieces cut to predetermined size in preparation for subsequent work) by abrasive water-jet, blanking dies, or routing. Aluminum blanks are heat-treated to anneal them (give them a uniform, strain-free structure that will increase their malleability). The blanks are then refrigerated until they are placed in dies where they will be pressed into the proper shape. After forming, the sheet metal details are aged to full strength and trimmed by routing to final shape and size.

       Sheet metal parts are cleaned before being assembled by riveting or adhesive bonding. Aluminum parts and welded subassemblies may be anodized (treated to thicken the protective oxide film on the surface of the aluminum), which increases corrosion resistance. All metal parts are chemically cleaned and primer-painted, and most receive finish paint by spraying with epoxy or other durable coating.

       Making the cores of composite components

       Cores, the central parts of the composite components, are made of Nomex (a brand of aramid produced by Du Pont) or aluminum "honeycomb," which is cut to size by bandsaw or reciprocating knife. If necessary, the cores then have their edges trimmed and beveled by a machine tool similar to a pizza cutter or meat slicing blade. The material with which each component is built up from its cores (each component may use multiple cores) is called pre-preg ply. The plies are layers of oriented fibers, usually epoxy or polyimide, that have been impregnated with resin. Following written instructions from the designers, workers create highly contoured skin panels by setting individual plies on bond mold tools and sandwiching cores between additional plies as directed.

       Completed layups, as the layers of prepreg affixed to the mold are called, are then transported to an autoclave for curing. An autoclave is a machine that laminates plastics by exposing them to pressurized steam, and "curing" is the hardening that occurs as the resin layers "cook" in the autoclave.

       Visible trim lines are molded into the panels by scribe lines present in the bond mold tools. Excess material around the edges is then removed by bandsawing. Large panels may be trimmed by an abrasive water-jet manipulated by a robot. After inspection, trimmed panels and other composite details are cleaned and painted by normal spray methods. Surfaces must be well sealed by paint to prevent metal corrosion or water absorption.

       Making the fuselage

       Canopies or windscreens and passenger compartment windows are generally made of polycarbonate sheet. Front panels subject to bird strike or other impact may be laminated of two sheets for greater thickness. All such parts are made by placing an oversized blank on a fixture, heating it, and then forming it to the required curvature by use of air pressure in a freeblowing process. In this method, no tool surface touches the optical surfaces to cause defects.

       Installing the engine, transmission,

       and rotors

       Modern helicopter engines are turbine rather than piston type and are purchased from an engine supplier. The helicopter manufacturer may purchase or produce the transmission assembly, which transfers power to the rotor assembly. Transmission cases are made of aluminum or magnesium alloy.

       As with the above, the main and tail rotor assemblies are machined from specially selected high-strength metals but are produced by typical machine shop methods. The rotor blades themselves are machined from composite layup shapes. Main rotor blades may have a sheet metal layer adhesively bonded to protect the leading edges.

       Systems and controls

       Wiring harnesses are produced by laying out the required wires on special boards that serve as templates to define the length and path to connectors. Looms, or knitted protective covers, are placed on the wire bundles, and the purchased connectors are soldered in place by hand. Hydraulic tubing is either hand-cut to length and hand-formed by craftsmen, or measured, formned, and cut by tube-bending machines. Ends are flared, and tubes are inspected for dimensional accuracy and to ensure that no cracks are present. Hydraulic pumps and actuators, instrumentation, and electrical devices are typically purchased to specification rather than produced by the helicopter manufacturer.

       Final assembly

       Finished and inspected detail airframe parts, including sheet metal, tubular, and machined and welded items, are delivered to subassembly jigs (fixtures that clamp parts being assembled). Central parts are located in each jig, and associated details are either bolted in place or, where rivets are to be used, match-drilled using pneumatically powered drills to drill and ream each rivet hole. For aerodynamic smoothness on sheet metal or composite skin panels, holes are countersunk so that the heads of flat-headed screws won't protrude. All holes are deburred and rivets applied. A sealant is often applied in each rivet hole as the rivet is inserted. For some situations, semi-automated machines may be used for moving from one hole location to the next, drilling, reaming, sealing, and installing the rivets under operator control.

       After each subassembly is accepted by an inspector, it typically moves to another jig to be further combined with other small subassemblies and details such as brackets. Inspected "top level" subassemblies are then delivered to final assembly jigs, where the overall helicopter structure is integrated.

       Upon completion of the structure, the propulsion components are added, and wiring and hydraulics are installed and tested. Canopy, windows, doors, instruments, and interior elements are then added to complete the vehicle. Finish-painting and trimming are completed at appropriate points during this process.

       After all systems are inspected in final form, along with physical assemblies and appearance aspects, the complete documentation of materials, processes, inspection, and rework effort for each vehicle is checked and filed for reference. The helicopter propulsion system is tested, and the aircraft is flight-tested.

       世界顶级十大豪华房车是：奔驰蓝涧S、曼TGE马布哈豪华房车、安静豪华房车、斯派斯康帕尼豪华房车、加拿大渡乐TERRA豪华房车、Travel Master豪华房车、德国霍尔斯豪华房车、日本V-MAX豪华房车、瑞弗v820豪华房车、阿尔芒达Monaco豪华房车。

       1、奔驰蓝涧S

       奔驰作为豪华房车的代表品牌，在设计上一直走高档豪华路线。奔驰房车配备的设施齐全，舒适度也非常出众。典型车型如蓝涧S，被业内人士誉为“奔驰之光”。

       2、曼TGE马布哈豪华房车

       曼TGE马布哈豪华房车使用了长轴距的顶级曼TGE为基础。车里面设有卫生间、淋浴、双人床室和客厅等设施。除此之外，这一款车具有强大的发动机和独特的四轮驱动技术，令人瞩目。

       3、安静豪华房车

       安静豪华房车是由美国底特律公司Airstream制造的。这一款车堪称经典。它长8.15米，重3.9吨，外壳由铝塑板制成，内部设有洗手间、淋浴、厨房、饭厅、卧室等设施。这一款房车配有11升气体储存罐和自然气发动机，使其成为一辆真正的“绿色环保车”。

       4、斯派斯康帕尼豪华房车

       斯派斯康帕尼豪华房车是英国最著名的房车之一。这一款车银色的车身和绿色的车窗使这一款车看起来特别惊艳，它内部设有豪华浴室、卧室、酒吧和用餐区等设施。

       5、加拿大渡乐TERRA豪华房车

       这一款车是一款奢华、可持续绿色的大型豪华房车。车身长8.5米，重量约为5吨，它内部设有双人床、冰箱、电视、洗手间、淋浴室等设施，还能在线工作和学习。

       6、Travel Master豪华房车

       这一款车的外形没有太多花哨的装潢，但它内部豪华，具有4个睡眠位置，舒适的起居区，而且这一款车可以拆卸和替换为商务车底盘，大大的提高了用的灵活性。

       7、德国霍尔斯豪华房车

       这是一款制造精致的房车，它具有亮白色的车身、流线型的轮廓，在设计上大量使用了花岗岩、木材等材料，使这一款车从里到外都显得豪华。内部设有卫生间，厨房，餐厅和卧室等设施。

       8、日本V-MAX豪华房车

       这一款车使用了气压式悬挂系统，能够让汽车处在最舒适的状况，加入科技感也同样是不少，例如：无线充电和智能家居系统等。车里面还设有高级卫生间、双人大床和超大的电视屏幕，是非常适合两个人度过一个长假的房车。

       9、瑞弗v820豪华房车

       这一款车定位是商务乘用车辆，但是它的内部非常豪华。它有一系列全尺寸的浴室和厨房，可以便利旅客在旅程中得道舒适与满足。车里面配备有一个电视，冰箱和音响系统等。

       10、阿尔芒达Monaco豪华房车

       这一款车被认为是最豪华的房车之一。车身长15.8米，内部设有品牌菜式的厨房、浴室、卫生间、卧室、360度旋转电视、4G网络等等。这一款车配备有一个定制的沙发，可以调整为一个超级舒适的床，让乘客在旅途中得道充分休息。

       以上内容参考：百度百科-梅赛德斯奔驰

       好了，今天我们就此结束对“airstream”的讲解。希望您已经对这个主题有了更深入的认识和理解。如果您有任何问题或需要进一步的信息，请随时告诉我，我将竭诚为您服务。