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1.把激光射束射向地球Laserbeamsareemittedatthemoon2.这个模型描述了原子的情况Thismodelisdescriptiveofthebehaviorofanatom3.那位教授将做有关移动通讯方面的讲座Thatprofessorwilldeliveralectureonmobilecommunication4.她给本科生上C++程序设计语言课ShegivesundergraduateslessonsintheC++programminglanguage5.这些学生在做物理实验Thesestudentsaremakinganexperimentinphysics6.他们在做电学实验Theyaredoinganexperimentonelectricity7.该教授对沃氏函数的研究起了重要作用TheprofessorhasplayedanimportantroleintheresearchontheWalshFunctions8.无线电波朝四面八方传播Radiowavestravelinalldirections9.为此，我们必须在负载两端接一个电容器Forthispurpose,wemustconnectacapacitoracrosstheload10.在这个温度上该金属就会融化Atthistemperaturethemetaiwillmelt11.该专家将在会议上宣读一篇重要的学术论文Theexpertwillreadanimportantacademicpaperattheconference12.速度等于距离与时间之比Speedistheratioofdistancetotime13.太阳离地球的距离是很远的Thedistanceofthesunfromtheearthisverygreat14.温度对金属导电率的影响是很小的Theeffectoftemperatureonconductivityofmetalsissmall15.本节论述晶体管与电子管相比的优点Thissectiondealswiththeadvantagesoftransistorsoverelectrontubes16.重力加速度随纬度的变化，部分原因是由于地球的自转Thevariationofgwithlatitudeisdueinparttotheearth’srotation17.Y对x的依从关系用y=f(x)表示Thedependenceofyonxisexpressedbyy=f(x)18.人们用椭圆来描述行星绕太阳的运行情况Ellipsesareusedtodescribethemotionsoftheplanetsaroundthesun19.我们讨论了电流通过酸碱盐溶液的情况Wehavediscussedthepassageofanelectriccurrentthroughliquidsolutionsofacids,bases,andsalts20.物体对净力F的影响就是正比于F的加速度aTheresponseofabodytoanetforceFisanaccelerationaproportionaltoF21.把式（4）与式（6）相比较，我们就能的得到一下几个关系式AcomparisonofEq.(4)withEq.(6)Leadstothefollowingrelations22.我们可以把一个力分解成x和y分量Theresolutionforceintoxandycomponentsispossible23.应避免使人体接触有潜在毒性的物质Exposureofthebodytopotentiallytoxicsubstancesshouldbeavoided24.这些特殊问题是有把原子能用作为能源而产生的Thesespecialproblemsarisefromtheuseofatomicenergyasasourceofpower25.把电流定义为电荷的运动对我们大家都是熟悉的Thedefinitionofanelectriccurrentastheflowofelectricchargeisfamiliartoallofus26.哥伦布发现美洲是在哪一天WhatisthedateofthediscoveryofAmericabyColumbus27.爱因斯坦确立了相对论是20世纪最重要的事件之一TheformationofthetheoryofrelativitybyEinsteinisoneofthemostsignificanteventsofthe20thcentury28.门捷列夫于1869年发现了周期表使人们有了计算原子质量的另一种方法ThediscoveryoftheperiodictablebyMendeleevin1869suggestedanotherwayofestimatingatomicmasses29.这个工厂和那个一样大Thefactoryisaslargeasthatone30.铜的导电能力几乎和银一样好Copperconductselectricityalmostaswellassilver31.这台计算机的体积是一台打印机的3倍Thesizeofthiscomputeristheretimesaslargeasthatofatypewriter32.那根导线长达100米Thatwireisaslongas100meters33.这根导线不如那根长Thiswireisnotaslongasthatone(is)34.这台计算机的性能不如那台好Thiscomputerdosenotworksowellasthatone35.导线越长，电阻越大Thelongerthewire,thegreatertheresistance36.电压越大，电流就越大Thegreaterthevoltage,thelargerthecurrent37.电流越大，在导线中产生的热量就越多Thelargerthecurrent,themoreheatwillbeproducedinthewire38.你学习越努力，你的进步就会越大Theharderyoustudy,thegreaterprogressyouwillmake39.在无线电接收机中，一部分功率转变成了声波Inaradioreceiver,somepowerisconvertedtosongwaves40.绝缘体可以被用在导体之间来防止电流在他们之间流动Insulatorsmaybeusedbetweenconductorsinordertopreventtheflowofelectriccurrentbetweenthem41.把理论应用于实践是非常重要的Toapplytheorytopracticeisveryimportant42.制作这样的电感器需要许多这样的线匝和铁芯Toconstructsuchinductorsrequiresmanyturnsofwireandironcores43.现在能够把太阳光直接转变成电Itisnowpossibletoconvertsunlightdirectlyintoelectricity44.我们似乎能求出这个电流Itseemspossibletofindoutthiscurrent45.操作这台机器并不是件容易的事Itisnotaneasyjobtooperatethismachine46.做实验是极为重要的Itisofgreatimportancetomakeexperiments47.解这个方程将要花费我们许多时间Itwilltakeusalotoftimetosolvethisequation48.我们发现用弧度而不是用度数表示角度是比较方便的Itisfoundconvenienttoexpressanglesinradiansratherthanindegrees49.当电流流过电路时，要损耗掉一部分能量Flowingthroughacircuit,thecurrentwilllosepartofitsenergy50.若已知电流和电阻，我们就能求出电压Givencurrentandresistance,wecanfindoutvoltage51.由于铜具有大量的自由电子，所以它是良导体Havingalargenumberoffreeelectrons,copperisagoodconductor52.若用公式表示的话，电路中的电压，电流，电阻之间的关系可写成V=IRExpressedinaformula,therelationshipbetweenvoltage,currentandresistanceinacircuitcanbewrittenasV=IR53.由于铜是电的良导体，所以被广泛的用在电工技术中Beingagoodconductorofelectricity,copperiswidelyusedinelectricalengineering54.银是最好的导体，其次是铜Silveristhebestconductor,followedbycopper55.Σ是希腊字母“西格玛”，它的意思是“...之和”ΣistheGreeklettersigma,meaning“thesumof”56.当机车拉着火车跑时，它就会做功Alocomotivedoesworkwhilepullingamovingtrain57.将物体置于水中，就会感觉到他比较轻Whenplacedinwater,everythingwillbefoundlighter58.这一设备，如果设计得当就可以用无线电控制Thisdevice,properlydesigned,canbecontrolledbyradio59.当把雷达信号发向月球时，由于月球是固体，所以能反射信号Whenradarsignalsaresenttothemoon,themoon,beingsolid,reflectsthem60.若该电流发生变化，磁场也将变化Thiscurrentchanging,themagneticfieldwillchangeaswell61.若其他情况相同，电阻将正比于导体的长度Otherthingsbeingequal,theresistanceisdirectlyproportionaltothelengthoftheconductor62.当阳光照在光电电池上时，该设备就会自动工作起来Thesunlightfallinguponphoto-electriccells,thedevicewillautomaticallygointooperation63.由于原子很小，所以我们看不见它们Atomsbeingextremelysmall,wecannotseethem64.几乎所有的金属都是良导体，而银为最好Almostallmetalsaregoodconductors,silverbeingthebest65.每当导体内的电流发生变化时就会在到体内感应出一个电动势，因而这种电动势就成为自感电动势Wheneverthereisachangeofcurrentinaconductor,anemfisinducedintheconductor,thusthiskindofemfbeingcalledaself-inducedemf66.银在金属中电阻率最低，而铜的电阻率比他高不了很多Silverhasthesmallestresistivityofanymetal,withthatofcoppernotmuchgreater67.若电路中没有电阻，电流就会无限增大Withnoresistanceinthecircuit,thecurrentwouldincreaseforever68.我们周围的一切东西均是物质这一事实是大家都知道的Thefactthateverythin