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词义的选择英汉两种语言都有一词多类、一词多义的现象。一词多类就是指一个词往往属于几个词类，具有几个不同的意思。一词多义就是说同一个词在同一个词类中，又往往有几个不同的词义。根据词类选择词义Anelectronisanextremelysmallcorpusclewithnegativechargewhichroundsaboutthenucleusofanatom.电子是绕着原子核转动带有负电荷的极其微小的粒子。（动词）Theearthgoesroundthesun.地球环绕太阳运行。（介词）Roundsurfacereflectorisakeyunitforthesolarenergydevice.弯曲面反射器是太阳能装置的关键元件。（形容词）Thetreemeasuresfortyinchesround.这棵树树围40英寸。（副词）Thisisthewholeroundofknowledge.这就是全部的知识范围。（名词）Likechargesrepel,unlikechargesattract.同性电荷相斥，异性电荷相吸。（形容词）Inthesunbeampassingthroughthewindowtherearefinegrainsofdustshininglikegold.在射入窗内的阳光里，细微的尘埃象金子一般在闪闪发亮。（介词）Itistheatomsthatmakeupiron,water,oxygenandthelike.正是原子构成了铁、水、氧等类物质。（名词）Helikesmakingexperimentsinchemistry.他喜欢做化学实验。（动词）Wavesinwatermovelikethewaveformmovesalongarope.波在水中移动就象波形沿着绳子移动一样。（连词）Plasticswasatfirstbasedoncoalandwood.最初塑料是从煤和木材中提取的。（动词）Asweallknow,abasereactswithanacidtoformasalt.众所周知，碱与酸起反应变成盐。（名词）Ironandbrassarebasemetals.铁和黄铜为非贵重金属。（形容词）Wehavenowaccumulatedaconsiderablebodyofknowledgeaboutelectronics.目前，我们在电子学方面已经积累了大量知识。（名词）Theyareindesperateneedofthiskindofbodiedoil.他们非常需要这种聚合油。（过去分词）Imaginationbodiesforththeformsofthingsunknown.想象力能使未知事物的形象呈现出来。（动词）根据上下文选择词义Ourworktodayistoworkoutthedesign.我们今天的工作是把设计做出来。Tomovesomethingistodowork.移动物体就是作功。Welikehisworksverymuch.我们非常喜欢他的著作。Thebuildingofthesegiantironandsteelworkswillgreatlyacceleratethedevelopmentoftheironandsteelindustryofourcountry.这些大型钢铁厂的建立会大大地加速我国钢铁工业的发展。Theworksofthesewatchesandclocksareallhome-produced.这些钟表里的机件全部都是国产的。Weshouldpointout，however，thata11electricalsystemsarenotconservative．然而，应该指出并非所有电的系统都是守恒系统。Ifyoupushhardagainstsomethingandmoveit，youhavedonework．如果用力推一件东西而移动了，就作了功。Beforeitbeginstowork，theyeastissubjecttodisruptioncausedbyfluctuationsintemperature．酵母在发酵之前，易受温度变化的影响而产生分解。Thevolumevariesasthetemperatureincreases．体积随着温度增加而变化。Ascottonisliabletoabsorbmoisture，theinsulationwillbeadverselyaffected．因为棉花容易吸收水分，其绝缘性能会受到不利影响。Smallasatomsare，electronsarestillsmaller．原子虽然小，但电子更小。Electronsmoveroundthenucleusjustasplanetsmoveroundthesun．电子绕原子核转动，就像行星绕太阳运行一样。根据学科专业选择词义Theelectronicmicroscopepossessesveryhighresolvingpowercomparedwiththeopticalmicroscope.与光学显微镜相比，电子显微镜具有极高的分辨率Powercanbetransmittedoveralongdistance.电力可以输送到很远的地方。Thefourthpowerofthreeiseighty-one.3的4次方是81。Thecombiningpowerofoneelementinthecompoundmustequalthecombiningpoweroftheotherelement.化合物中一种元素的化合价必须等于另一元素的化合价。Explosivetechnologicaldevelopmentafter1940gavethemedicalprofessionenormouspowertofightdiseaseandsickness.1940年以来，随着技术的迅速发展，医学界大大提高了战胜疾病的能力。Semiconductordeviceshavenofilamentorheatersandthereforerequirenoheatingpowerorwarmeduptime.半导体器件没有灯丝，因此不需要加热功率和加热时间。Acarneedsalotofpowertogofast.汽车高速行驶需要很大动力。Streamsandwaterfallaresuitableforthedevelopmentofhydroelectricpower.溪流和瀑布适合用于开发水电能源。Whatismeantby“power”?By“power”．wemeantherateofdoingwork．功率是什么?所谓功率，我们指的是做功的速率。(机械学)Specialequipmentassuresthatthecomputerswillnotbedisturbedbypowerinterruptionsthatlastlessthantwohours．在停电两小时以内的情况下，有专门设备能保证计算机正常工作。(电学)Thethirdpowerof3is27。3的三次方(幂)是27。(数学)Thisisa20powerbinocularmicroscope．这是一架20倍双目显微镜。(光学)Aluminumhasacombiningpowerofthree铝的化合价是三。(化学)Itisbeyondthepowerofmedicinetocurehim．他的病非药力所能治愈。(医学)Thenucleusistheinformationcenterofthecell.细胞核是细胞的信息中枢。Hewasimprisonedinacell.他被关在监狱的单人小牢房中。Inthecenterofthespaciousworkshopstoodacellwithpacketsofblockanodes.在宽敞的车间中央有一个装有一组组阳极板的电解槽。Whentheendsofacopperwirearejoinedtoadevicecalledanelectriccellasteadystreamofelectricityflowsthroughthewire.当把一根铜丝的两端连接到一种叫做电池的电器上时，就会有稳定的电流流过该铜丝。Thelatheshouldbesetonafirmbase．车床应安装在坚实的底座上。(机械)Asweallknow，abasereactswithanacidtoformasalt．众所周知，碱与酸反应生成盐。(化学)Atransistorhasthreeelectrodes，theemitter，thebaseandthecollector．晶体管有三个电极，即发射极，基极和集电极。(电子)LineABisthebaseofthetriangleABC．AB线是三角形ABC的底边。(几何)Abaseoflogarithmsmustbeapositivenumber，notequaltoOne．对数的底数必须是一个不为1的正数。(数学)Heisonthesecondbase．他在二垒。(体育)试译下列各句，注意根据词类确定划线词的词义：Aluminumislightandstrongsothatitiswidelyusedinaircraftindustry.Likechargesrepel,whileunlikechargesattract.Itistheatomsthatmakeupiron,water,oxygenandthelike.Amagneticfieldisbuilduproundthecoil.Smallasatomsare,electronsarestillsmaller.Key:铝既轻又坚硬，所以广泛用于航空工业。同性电荷相斥，异性电荷相吸。正是原子构成了铁、水、氧等等。线圈周围形成了一个磁场。原子虽小，但电子却更小。试译下列各句，注意根据上下文确定划线词的词义：Whensunlightfallsontheleavesofplants,itistransformedintochemicalenergy.Thereisnophysicalcontactbetweenworkpieceandtool.Theamountofworkisequaltotheproductoftheforcebythedistance.Thethickerthewire,themorefreelyitwillcarrycurrent,andthelessitsresistance.Whenthepressuregetslow,theboilingpointbecomeslow.Key:当阳光照在植物的叶子上时，就变成化学能。工件和刀具不直接接触。功的大小等于力和距离的乘积。导线越粗，就越容易导电，电阻也就越小。气压低，沸点就低。