职称英语理工类考试考前每日一练(26)

　　职称英语理工类考试考前每日一练

　　概括大意与完成句子

　　The Tiniest Electric MOtOr in the W0rId

　　1. Scientists recently made puhlic the tinjest electric motor ever huilt. You ld stuff hundrefls 0f them into the period at the end 0f this sentence. One day a similar engine might power a tiny mechanical doetor that WOUld travel through your hodv t0 remove your disease.

　　2. The motor workshy shuffling atoms between two molten metal droplets in a carhon nanotube. One droplet is even smallerthan the 0ther. When a small electric current is applied to the droplets， atoms s10wly get out of the larger droplet and join the smaller one.The sinall droplet growshut never gets as big as the other dropletand eventually humps i。nto the large droplet. As they touch，the large dmplet rapidly sops up the atoms it had prevviouslv lost. This quick shift in energy produces a power stroke.

　　3. The technique exploits the flact that surface tensionthe tendeney 0f atoms or molecules to re一 sist separatlngbecomes more important at small scales. Surfaee tension is the same thing that aUOWS some insects t0 walk on water.

　　4. Although the amount 0f energy produced is small--20 microwattsit is quite inlpressive in relation t0 the tiny seale of the motor. The whole setup is less than 200 nanometers 0n a side. 0r hundreds of times smaIler than the width 0f a human hair. If it COUld he sealed uD to the size 0f an au tomobile engine，it wonld be 1 00 milJion times more powerful than a Toyota Camrys 225 horsepower V6 engine.

　　5. In 1988，Pmfessor Richard Muller and c0eagues made the first 0peratlng micromotor，which as 100 microns across，0r about the thickness of a human hair. In 2003，Zettls group created the first nanoscale motor. In 2006，they buih a nanoconveyor，which moves tiny panicles a10ng Iike carsin a factory。

　　6.Nanotechnology engineers try to mimic nature，building things atom-bv-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 yur body to find disease and repair damaged cells.

　　词汇：

　　shuffle v.来回运动

　　nanometer n.纳米，毫微米

　　molten adj.熔化的

　　micromotor n.微电机

　　droplet n.小滴

　　nanotube n.纳米管

　　Nanoconveyor n.纳米传送带

　　nanotechnology n.纳米技术

　　hump v.碰撞

　　mimic v.模仿

　　sop v.吸人

　　stroke n.行程，冲程

　　microwatt n.微瓦

　　nanomotor n.纳米发动机

　　nanomachine n.纳米机器

　　注释：

　　1.Power stroke：动力行程

　　2.at small scales：在小等级上。这里指的是在纳米等级上。

　　3.it is quite impressive in relation to the tiny scale of the motor：与电动机的小等级相比，功率是相当可观了。in relation to是与相比，如：The city is quite large in relation to its population.

　　4.Setup：装置。这里指nanomotor。

　　5.If it could be scaled up to the size of an automobile engine：如果纳米电动机能按比例放大到汽车发动机的尺寸。scaleup to是把按比例放大到。

　　练习：

　　1.Paragraph 2

　　2.Paragraph 4

　　3-Paragraph 5

　　4.Paragraph 6

　　A An introduction of a Toyotas 225 horsepower V6 engine.

　　B A description of the nanomotor in terms of power and size。

　　C Surface tension.

　　D Previous inventions of nanoscale products.

　　E The working principle of the nanomotor.

　　F P0ssible fields of application in the future.

　　5.Doctors envision that the nanomotor wouht travel through human bodies to

　　6.Surface tension means the tendency of atoms or molecules to

　　7.Nanoconveyors could be used.t0

　　8.Applying a snmll electric current causes atoms to

　　A remove disease

　　B resist separating

　　C shuffle between two molten metal droplets

　　D power nanomachines

　　E Sop up molecules from the large droplet

　　F Transport nanoscale ob;iects