职称英语 理工A概括大意与完成句子 字典版

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1、32FJ gong-a 第十一篇The Tiniest Electric Motor in the World1 Scientists recently made public the tiniest electric motor ever built. You could stuff hundreds of them into the period at the end of this sentence. One day a similar engine might power a tiny mechanical doctor that would travel through your b

2、ody to remove your disease. 2 The motor works by shuffling atoms between two molten metal droplets in a carbon nanotube. One droplet is even smaller than the other. When a small electric current is applied to the droplets, atoms slowly get out of the larger droplet and join the smaller one. The smal

3、l droplet grows but never gets as big as the other droplet and eventually bumps into the large droplet. As they touch, the large droplet rapidly sops up the atoms it had previously lost. This quick shift in energy produces a power stroke 3 The technique exploits the fact that surface tension the ten

4、dency of atoms or molecules to resist separating becomes more important at small scales. Surface tension is the same thing that allows some insects to walk on water. 4 Although the amount of energy produced is small 20 microwatts it is quite impressive in relation to the tiny scale of the motor. The

5、 whole setup is less than 200 nanometers on a side, or hundreds of times smaller than the width of a human hair. If it could be scaled up to the size of an automobile engine, it would be 100 million times more powerful than a Toyota Camrys 225 horsepower V6 engine. 5 In 1988, Professor Richard Mulle

6、r and colleagues made the first operating micromotor, which was 100 microns across, or about the thickness of a human hair. In 2003, Zettls group created the first nanoscale motor. In 2006, they built a nanoconveyor, which moves tiny particles along like cars in a factory. 6 Nanotechnology engineers

7、 try to mimic nature, building things atom-by-atom. Among other things, nanomotors could be used in optical circuits to redirect light, a process called optical switching. Futurists envision a day when nanomachines, powered by nanomotors, travel inside your body to find disease and repair damaged ce

8、lls. 练习： 1Paragraph 2 E The Working Principle of the Nanomotor2Paragraph 4 B A Description of the Nanomotor in Terms of Power and Size3Paragraph 5 D Previous Inventions of Nanoscale Products4Paragraph 6 F Possible Fields of Application in the Future5Doctors envision that the nanomotor would travel t

9、hrough human bodies to A remove disease6Surface tension means the tendency of atoms or molecules to B resist separating7Nanoconveyors could be used to F transport nanoscale objects8Applying a small electric current causes atoms to C shuffle between two molten metal droplets世界上最小的电动机最近科学家公布了现有的最小的电动机

10、。就是在这句话的句号里，你也能塞进几百个这样的电动机。将来有一天，类似的发动机也许能够为一个微型机械医生提供动力，在人的身体里自由移动，治疗疾病。 发动机通过碳纳米管中的原子在两小滴金属溶液间来回运动进行工作。其中一个小滴甚至比另一个还要小。当微弱的电流通过时，大一点的小滴金属溶液中的原子就会缓慢逸出，进入小一点的小滴。这样，后者体积不断增大但绝不会大到和前者一样最后，与大一点的小滴金属溶液相撞。当它们接触时，大的小滴便夺回它失去的原子。能量这样迅速地来回运动就产生一次动力冲程。 这项技术利用了表面张力的原理原子或分子有不愿被分开的倾向这在纳米等级上更加重要。表面张力同样也使某些昆虫能在水上行

11、走。 虽然这样产生的能量很少只有20 微瓦，但与电动机的小等级相比，功率也是相当可现了。整个装置一侧的长度不到200纳米，比人类一根头发的宽度还要小几百倍。如果纳米电动机能按比例放大到汽车发动机的尺寸，它将会比丰田凯美瑞的225 马力的V6 引擎功率还要大1 亿倍。 1988 年，理查德乌勒教授和他的同事发明了第一台微型发动机， 100 微米长，或者说有一根头发那么粗。2003 年，泽特尔的小组制造出第一台纳米级的发动机。2006 年，他们又造出了纳米传送带，能够像工厂里传送汽车那样移动极小的粒子。 纳米技术的工程师尽力去模拟自然，用一个个原子来制造物体。在这些事物当中，纳米发动机能够被用于光

12、电路来改变光的方向，该过程被称为光学转换。未来主义者预想有一天，被纳米发动机驱动的纳米机器能在人体内移动，发现疾病并修复被破坏的细胞。第十二篇A Strong Greenhouse Gas1 Methane is a colorless, odorless gas; it is also a potent greenhouse gas, and once released into the atmosphere, it absorbs heat radiating from Earths surface. Thats why methane is a major contributor to

13、the planets increasing temperature rise or global warming. Molecule for molecule, methanes heat-trapping power in the atmosphere is 21 times stronger than carbon dioxide, the most abundant greenhouse gas. 2 With 13 billion cows belching almost constantly around the world (100 million in the U. S. al

14、one), its no surprise that methane released by livestock is one of the chief global sources of the gas. Other prime methane sources: petroleum, drilling, coal mining, solid-waste landfills and wet lands. 3 Greenhouse gases like methane and carbon dioxide make up only a small part of Earths atmospher

15、e, which is 78 percent nitrogen and nearly 21 percent oxygen. And without greenhouse gases to trap the suns heat and warm the planet, life as we know it couldnt exist. But in the last 200 years, human activity that requires burning oil, natural gas, and coal for energy has magnified the greenhouse e

16、ffect. 4 Atmospheric concentrations of methane have more than doubled in the last two centuries. Blame for this often focuses on big industries and gas-guzzling vehicles. But agriculture plays a major role, too. In the past 40 years alone, the global cattle population has doubled. 5 Cows munch mostl

17、y grasses and hay yet they grow big and hefty. Why? Because of the rumen. The rumen holds 160 liters of food and billions of microbes. These microscopic bacteria and break down cellulose and fiber into digestible nutrients. A cow couldnt live without its microbes. As the microbes digest cellulose, t

18、hey release methane. The process occurs in all animals with a rumen (cows, sheep, and goats, for example), and it make them very gassy. Its part of their normal digestion process. When they chew their cud, they regurgitate some food to rechew it, and all this gas comes out. The average cow expels 60

19、0 liters of methane a day. 6 Thats why we say livestock gas is also a major factor of causing the global warming. 练习: 1. Paragraph 1 E Methane as a Strong Greenhouse Gas2. Paragraph 2 F Livestock as a Prime Factor of the Greenhouse Effect3. Paragraph 4 C Agriculture Also Contributes to Increased Con

20、centrations of Methane in the Atmosphere4. Paragraph 5 D Why Livestock Releases Methane5. Methane is to the intensifying greenhouse effect. A one of the major contributors6. Greenhouse gases are indispensable to mankind, but the problem mankind is faced with is B the ever-increasing atmospheric conc

21、entrations of greenhouse gases7. Generally people heap criticism on for the planets temperature rise. F big industries and gas-guzzling vehicles8. Nothing has been mentioned in the passage about E how to cut down the cattle populations一种强烈的温室气体甲烷是一种无色无味的气体，同时也是一种很强烈的温室气体，一旦释放到空气中，就会吸收地球表面散发的热量。所以说甲烷

22、是使这个星球日趋变暖(或叫全球变暖)的一个主要原因。按分子与分子对比，甲烷在大气中吸收热量的能力是二氧化碳最丰富的温室气体的21倍。 由于全世界有130亿头牛几乎在连续不断地打嘀(仅美国就有1亿头)，难怪由牲畜释放的甲烷成为全球甲烷的主要来源。其他主要的甲烷来源有:石油、钻井、采煤、固体垃圾以及沼泽地。 甲烷和二氧化碳等温室气体只占地球大气的一小部分，大气中78%为氯气，将近21%为氧气。如果没有温室气体来吸收太阳的热量，使地球变暖，我们所知道的生命就不会存在。但在过去的200年里，通过燃烧油、天然气和煤来获取能量的人类活动加剧了温室效应。在过去的两个世纪里，甲烧在大气中的浓度增加了一倍多，人

23、们常常将此归罪于大工业和汽车。但是，农业在其中也扮演了一个重要角色。仅在过去40年里，全球牲畜数量就翻了一番。 牛吃的大部分是草，但却长得身高体壮。原因何在?在于它们都长有瘤胃。它们的瘤胃可容纳160升的食物，养育数十亿的微生物。这些微小的细菌和原生动物可分解纤维素，形成可吸收的营养。没有这些微生物，牛就无法生存。当微生物分解纤维素时，就会释放出甲烧。所有长有瘤胃的动物(比如牛、绵羊和山羊)都会这样，因此它们经常释放出气体，这是它们的正常吸收过程的一部分。它们反鱼时，就会将食物重新咀嚼，于是就释放出气体。一般每头牛每天会排出600升甲烷。 因此，我们认为，牲畜释放的气体也是全球变暖的一个主要因

24、素。第十三篇Face Masks May Not Protect from Super-Flu1 If a super-flu strikes, face masks may not protect you. Whether widespread use of masks will help, or harm, during the next worldwide flu outbreak is a question that researchers are studying furiously. No results have come from their mask research yet

25、. However, the government says people should consider wearing them in certain situations anyway, just in case. 2 But its a question the public keeps asking while the government are making preparations for the next flu pandemic. So the Centers for Disease Control and Prevention (CDC) came up with pre

26、liminary guidelines. We dont want people wearing them everywhere, said the CDC. The overall recommendation really is to avoid exposure. 3 When thats not possible, the guidelines say to consider wearing a simple surgical mask if you are in one of the three following situations. First, youre healthy a

27、nd cant avoid going to a crowded place. Second, youre sick and think you may have close contact with the healthy, such as a family member checking on you. Third, you live with someone whos sick and thus might be in the early stages of infection, but still need to go out. 4 Influenza pandemics can st

28、rike when the easy-to-mutate flu virus shifts to a strain that people never have experienced. Scientists cannot predict when the next pandemic will arrive, although concern is rising that the Asian bird flu might trigger one if it starts spreading easily from person to person. 5 During the flu pande

29、mic, you should protect yourself. Avoid crowds, and avoid close contact with the sick unless you must care for someone. Why arent masks added to this self-protection list? Because they can help trap virus-laden droplets flying through the air with a cough or sneeze. Simple surgical masks only filter

30、 the larger droplets. Besides, the CDC is afraid masks may create a false sense of security. Perhaps someone who should have stayed home would don an ill-fitting mask and hop on the subway instead. 6 Nor does flu only spread through the air. Say someone covers a sneeze with his or her hand, then tou

31、ches a doorknob or subway pole. If you touch that spot next and then put germy hands on your nose or mouth, youve been exposed. Its harder to rub your nose while wearing a mask and so your face may get pretty sweaty under masks. You reach under to wipe that sweat, and may transfer germs caught on th

32、e outside of the mask straight to the nose. These are the problems face masks may create for their users. 7 Whether people should or should not use face masks still remains a question. The general public has to wait patiently for the results of the mask research scientists are still doing. 练习： 1Para

33、graph 2 D Guidelines on Mask Use2Paragraph 3 C When to Use Face Masks3Paragraph 5 A Reasons for Excluding Masks from the Self-protection List4Paragraph 6 F Danger of Infection through Germy Hands and Masks5The scientists are trying to find out if masks may or may not E help protect people from being

34、 attacked by a flu6The CDC is afraid that the public may A overuse face masks7The public will not know the answer about masks until scientists F announce the results of their mask research8We can infer from the passage that the US authorities B deal with the mask problem seriously口罩也许无法预防感冒如果一场超级流感暴

35、发，口罩也许不能保护你。在下一次世界性的流感暴发期间，广泛使用口罩是否有用还是个问题，科学家正认真研究该题，但至今还没有任何结果。然而，为了以防万一，政府建议人们在某些情况下还是应当考虑佩戴口罩。 但当政府为下一次流感流行做准备时，公众仍心存疑问。所以美国疾病控制和预防中心提出了一些初步指导原则，我们不希望人们到处戴着口罩，他们说，总体上是建议要避免到有流感病毒的场合去。 在无法避免的情况下，指导原则提出，在以下三种情况下应考虑佩戴一个简易的外科手术口罩:第一，你很健康但要到一个人群拥挤的地方;第二，你已经生病了但仍要与健康的人接触，如家庭成员要来看你的病情;第三，与你居住在一起的人已经感冒了

36、，也许你已经处在传染的早期阶段，但你仍需外出。 当易变异的感冒病毒出现人们从未遇到过的新种类时，全国性的流行性感冒就会暴发。如果亚洲的禽流感开始轻易地在人与人之间传播，就可能会引起一场这样的大流行性疾病，虽然人们的忧虑不断升级，但科学家仍无法预测这样的大暴发什么时候会出现。 在流感期间，你应当学会自我保护。避免到人多的地方去，远离流感病人，除非你必须照顾病人。为什么不把口罩放入自我保护的措施中呢?口罩能把咳嗽或是打喷囔飞出的含有病毒的飞沫拦截住。但简易的外科手术口罩只能过滤大的飞沫。此外，美国疾病控制和预防中心担心口罩可能会制造出一种虚假的安全感。 也许原本会待在家里的人会戴上一个不合适的口罩

37、跑去坐地铁。 流感不仅仅是通过空气传染。有些人打喷囔时会用手遮挡，带有病毒的手会接触到门把手或是地铁里的扶手。如果你碰到这些东西，然后把带有流感病毒的手接触到嘴或者鼻子，你就有可能被传染。戴口罩时你很难去擦鼻子，于是脸在口罩下就变得汗津津的，当你去擦汗时，病毒就直接被带到了鼻子里。这些问题就是口罩带给他们的使用者的。 人们是否应该使用口罩仍然是个问题。公众还要耐心地等待科学家的研究结果。十四、The Magic Io Personal Digital Pen1Check out the io Personal Digital Pen launched by Logitech：Its a mag

38、ic pen that can store everything you write and transfer it to your computer. And you dont have to lug a hand-held device along with you for it to work.12Logitechs technology works like this：The pen writes normally, using normal ballpoint pen ink2. But while you are writing, a tiny camera inside the

39、pen is also taking 100 snapshots per second of what you are doing3, mapping your writing via a patchwork of minute dots printed on the paper. All this informationthe movement of your pen on the paper, basically is then stored digitally inside the pen, whether you are writing notes or drawing complex

40、 diagrams. You can store up to 40 pages worth of doodles in the pens memory. As far as you are concerned4, you are just using a normal pen.3It is only when you drop the pen into its PC-connected cradle that the fun begins. Special software on your PC will figure out what you have done, and begin to

41、download any documents you have written since the last time it was there. Depending on whether you have ticked certain boxes on the special notepad, it can also tell whether the document is destined to be an e-mail, a “to do” task, or a diagram to be inserted into a word-processing document. Once th

42、e documents are downloaded you can view them, print them out or convert them to other formats.4The io Personal Digital Pen is a neat and simple solution to the problem of storing, sharing and retrieving handwritten notes, as well as for handling diagrams, pictures and other non-text doodling. You do

43、nt have to carry a laptop along with you. All you have to do is just whip out the pen and the special paper and you are off5.5It is a great product because it does not force you to work differentlywalking around with a screen strapped to your arm, or carrying with you extra bits and pieces. The pen

44、is light and works like a normal pen if you need it to, while the special notepads look and feel like notepads. The only strange looks will be from people who are curious why you are writing with a cigar.6The io Personal Digital Pen also has potential elsewhere. FedEx6, for example, is introducing a

45、 version of the pen so that customers can fill out forms by hand instead of punching letters into cumbersome devices. Once that data is digital more or less anything can be done with it transferring it wirelessly to a central computer, for example, or via a hand-phone. Doctors could transmit their p

46、rescriptions direct to pharmacies, reducing fraud; policemen could send their reports back to the station, reducing paperwork.练习：1.Paragraph 2 F Working Principles of the Io Personal Digital Pen.2.Paragraph 3 BWays to Download the Stored Information3.Paragraph 5 AA Friendly and Convenient Device4.Pa

47、ragraph 6 CExamples of Other Potential Applications of the Io Pen5.There is no need to learn how to use the io Personal Digital Pen because Dit works like an ordinary pen.6.If you want to download what you have done with the magic pen, Eyou simply place the pen into its computer-connected cradle.7.T

48、he magic pen is particularly convenient when you work away from home or office because Ayou dont have to carry your laptop along.8.No matter what you write or draw, Fthe movement of your pen is recorded digitally inside the pen神奇的io私人数字笔仔细看看由Logitech公司发明的io私人数字笔吧。这是一种神奇的笔。可以将你写的所有东西储存下来并转换到计算机上，而你在使

49、用这种数字笔时却不必携带手持设备。Logitech技术的工作原理如下：这种笔使用一种普通的圆珠笔墨水，和平常一样写字。但是当你写字时，笔内的一个极小的摄像头也在以每秒钟100张的速度对你所写的内容进行快速拍摄，通过印在纸上的小点块拼出你所写的内容。然后，无论你是记笔记还是画复杂图表，所以的信息基本上都是笔在纸上的移动都将以数字形式存储于笔中。你可在笔的存储器中存储多达40页的资料。而对你来说，你只不过是在使用一支普通的笔而已。只有当你将笔插入与PC机连接的笔座中时，有趣的事才真正开始。你的PC机的专用软件会估算出你所做之事，并下载你最新写下的所有文件。根据你是否在专用记事本的一些特定框里打对号

50、，这种笔还可以辨别出文档是电子邮件、“待执行”人物还是要插入文字处理文档的图表。文档下载后，你就可以查看、打印或将其转换为其他形式。io私人数字笔可妥善又简单地解决手写笔记的存储、共享和检索问题，也可处理图表、图片以及其他非文本资料。你不必携带电脑，你只需要拿出笔和专门用纸就能开始工作了。这是一种很了不起的产品，因为你的工作不会因之产生任何麻烦你不必携带显示屏，也不必携带任何附件。它非常轻便，如果你需要的话，也可以当普通笔来用，而这种专用记事本看起来摸起来都很像普通记事本。有些人会很好奇，不明白为什么你在用雪茄写字，这是唯一看起来令人费解的地方。io私人数字笔在其他方面也很有潜力。例如，联邦快

51、递公司正引进一种数字笔，从而用户可用手填写表格，而无需再费力劳神地打进机器中。如果数字为数字型，几乎所有事情都可由这种笔来完成例如将数据通过无线方式或手机传输到中心计算机上。医生可将处方直接转到药房，减少了欺诈行为的发生。警察可将报告发回警察局，减少了文书工作。+第十五课Maglev Trains1 A few countries are using powerful electromagnets to develop high-speed trains，called maglev trains. Maglev is short for magnetic levitation，which me

52、ans that these trains float over a guideway using the basic principles of magnets to replace the old steel wheel and track trains. 2 If youve ever played with magnet，you know that opposite poles attract and like poles repel each other. This is the basic principle behind electromagnetic propulsion. E

53、lectromagnets are similar to other magnets in they attract metal objects，but the magnetic pull is temporary. You can easily create a small electromagnet yourself by connecting the ends of a copper wire to the positive and negative ends of an AA-cell battery. This creates a small magnetic field. If y

54、ou disconnect either end of the wire from the battery，the magnetic field is taken away. 3 The magnetic field created in this wire-and-battery experiment is the simple idea behind amaglev train rail system. There are three components to this system: A large electrical power source，metal coils lining

55、a guideway or track，and large guidance magnets attached to the underside of the train. 4 The big difference between a maglev train and a conventional train is that maglev trains do not have an engineat least not the kind of engine used to pull typical train cars along steel tracks.The engine for mag

56、lev trains is rather innoticeable. Instead of using fossil fuels，the magnetic field created by the electrified coils in the guideway walls and the track combine to propel the train. 5 The magnetized coil running along the track，called a guideway，repels the large magnets on the train s undercarriage，

57、allowing the train to levitate between 1 to 10 cm above the guideway.Once the train is levitated，power is supplied to the coils within the guideway walls to create a unique system of magnetic fields that pull and push th train along the guideway. The electric current supplied to the coils in the gui

58、deway walls is constantly alternating to change the polarity of the magnetized coi1s. This change in polarity causes the magnetic field in front of the train to pull the vehicle forward，while the magnetic field behind the train adds more forward thrust. 6 Maglev trains float on a cushion of air，elim

59、inating friction. This lack of friction allows these trains to reach unprecedented ground transportation speeds of more than 500 kph，or twice as fast as the fastest conventional train. At 500 kph，you could travel from Paris to Rome in just over two hours. 1. Paragraph 3 A、The Main Components of the

60、Maglev Train System2. Paragraph 4 E、Comparison of Maglev Trains with Traditional Ones3. Paragraph 5 C、The Working Principle of the Maglev Train4. Paragraph 6 B、High-speed Maglev due to Zero Friction5. Several countries in the world are using strong electromagnets A、to develop a maglev train rail sys

61、tem6. You can connect a wire to the positive and negative ends of a battery D、to create a magnetic field7. A unique system of magnetic fields is created by the coils C、to pull and push the train forward8. The frictionless maglev train enables you F、to travel from Paris to Rome in about two hours磁悬浮列

62、车一些国家正在使用强有力的电磁体发展高速列车，这种列车叫作磁悬浮列车。Maglev是磁悬浮的缩略词，它意味着这些列车漂浮在导向槽上，导向槽是使用磁铁的基本原理来替换原来的钢轮子和钢轨道的列车。 如果你曾经玩过磁铁，你知道异极相服，同极相斥的道理。这是电磁式推进背后的基本原理。电磁体与其他磁铁在吸引金属物品方面是一样的，但是电磁力 是暂时的。你能通过铜丝连接一节5号电池的正负极很容易地自己创造出一个小的电磁体。这就创造了一个小磁场。如果你从电池分开导线的任意一个末端，磁场就消失。 这个导线和电池实验创造的磁场是磁悬浮列车系统背后的简单想法。这个系统有三个成分：一个大电能来源、金属卷排列成导向槽或

63、轨道和附着在列车下面的大的导电磁体。 磁悬浮列车和传统列车之间的一个很大的大区别是磁悬浮列车没有发动机至少不是沿着轨道拉动典型的火车车厢的那种发动机。磁悬浮列车的发动机相当不显眼。代替矿物燃料的使用，由嵌入导向壁内的电磁线圈产生的磁场加上轨道，一起推动火车前进。 导向槽是沿着轨道延伸的带磁性的线圈。它排斥在列车的车盘上的大磁铁，允许列车在导向槽之上1-10cm之间悬浮。一旦列车被悬浮，就把力量供给在导向槽墙体之内的线卷来创造出一个单独的磁场系统，沿着导向槽推拉列车。在导向槽墙体内供给线圈的电流不断交替改变被磁化的线卷的极性。在极性上的变化造成了列车前面的磁场向前拉动列车，而在列车后面的磁场增加更多向前推力。 磁悬浮列车漂浮在气垫上来减少摩擦。这种缺乏摩擦(的状态)让这些列车超过500kph的速度，(这个速度)是地面交通工具史无前例的速度，或者是最快速的传统列车两倍的速度。500kph，你可能用刚好超过两个小时的(时间)从巴黎旅行到罗马。