从句的紧缩式：1.物体放在阳光下，它会变热。Anobjectbecomeshotwhenitisplacedinthesun.改写：Anobjectbecomeshotwhenplacedinthesun.2.安全火柴只有在被擦时才着火。Safetymatcheslightonlywhentheyarestricken.改写：Safetymatcheslightonlywhenstricken.3.当光线聚集在一点时，会产生大量的热。Whenlightisconvergedatapoint,itwouldproducelargequantityofheat.改写：Whenconvergedatapoint,thelightwouldproducelargequantityofheat.4.在亚横时，混泥土会产生较大侧压力。Considerablelateralpressureisexertedbytheconcretewhileit’sbeingcompacted.改写：Considerablelateralpressureisexertedbytheconcreteduringcompacted.用抽象名词或动名词代替动词：1.用这种方法试验机器需要消耗电力。Ifmachinesaretestedbythismethod,therewillbesomelossofpower.改写：Thetestingofmachinesbythismethod,entailssomelossofpower.2.用泵能抽去油箱中的油。Thecontentsofthetankaredischargedbyapump.改写：Dischargeofthecontentsofthetankisperformedbyapump.3.有必要检查一下这些结果是否准确。Itisnecessarytoexaminewhethertheseresultsareaccurate.改写：Itisnecessarytoexaminetheaccuracyoftheseresults.4.需要有关哪种燃料是最适合的情报。Informationisneededastowhichtypeoffuelismostsuitable.改写：Informationisneededastothemostsuitabletypeoffuel.5.工作的进展取决于这个机构的效率如何。Theprogressoftheworkwilldependonhowefficienttheorganizationis.改写：Theprogressoftheworkwilldependontheefficiencyoftheorganization.As的用法：1.这种发电机称为感应发电机。Thistypeofmotorisknown(referredto)asaninductionmotor.2.电流可以看成是穿过介质内的一股电子流。Electriccurrentmaybeconsidered(regarded;seen)asaflowofelectronsthroughamedium.3.这些材料可以归在导体类。Thesematerialsmaybeclassifiedasconductors.4.蒸汽冷凝成一层水膜。Thesteamiscooledandcondensedasafilmofwater.5.铸铁中的碳部分以自由石墨的形式存在。Thecarbonincast-ironispresentpartlyasfreegraphite.6.铜导线的导电率作为测量一切导电率的标准。Theconductivityofcopperwireistaken(accepted)as(being)thestandardforallmeasurementsofconductivity.“as+过去分词”正如，当：1.从炼油厂中得到的天然铀是一种固体。Naturaluraniumasobtainedfromtherefiningplantsisasolid.2.在反应堆中用的铀是一种细棒。Theuranium,asusedinthereactor,isintheformofathinrod.3.原来设计的那座桥造价太贵。Thebridge,asoriginallyplannedwouldhavebeentooexpensive.As+主动句：1.如图1.2所示…AsFig1.2shows…2.如第二十六页所示…Astheillustrationonpage26shows…3.正如我们所证实的…Aswehavej