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1、智课网TOEFL备考资料新托福综合写作详细解析：氢燃料摘要:新托福综合写作详细解析：氢燃料阅读材料：Carmanufacturersandgovernmentshavebeeneagerlyseekingareplacementfortheautomobilesmainsourceofpower,theinternal-combustionengine.Byfar,themostpromisingalternatives阅读材料：Carmanufacturersandgovernmentshavebeeneagerlyseekingareplacemen
2、tfortheautomobile’smainsourceofpower,theinternal-combustionengine.Byfar,themostpromisingalternativesourceofenergyforcarsisthehydrogen-basedfuel-cellengine,whichuseshydrogentocreateelectricitythat,inturn,powersthecar.Fuel-cellengineshaveadvantagesoverinternal-combustionenginesandw
3、illprobablysoonreplacethem.汽车制造商和政府都在积极地寻找内燃机的代替品，而目前内燃机是汽车主要的动力源。目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。鉴于燃料电池发动机相对于内燃机发动机优点多多，因而可以很快替代内燃机。Oneofthemainproblemswiththeinternal-combustionengineisthatitreliesonpetroleum,eitherintheformofgasolineordieselfuel.Petroleu
4、misafiniteresource,someday;wewillrunoutofoil.Thehydrogenneededforfuel-cellenginescannoteasilybedepleted.Hydrogencanbederivedfromvariousplentifulsources,includingnaturalgasandevenwater.Thefactthatfuel-cellenginesutilizeeasilyavailable,renewableresourcesmakesthemparticularlyattract
5、ive.内燃机发动机的问题之一就是对于石油的依赖，而石油具体的形式是汽油或者柴油。石油是不可再生资源，总有一天会用尽的。而燃料电池发动机所使用的氢则不是那么容易消耗完的。氢有多种来源，比如天然气和水。燃料电池发动机很容易得到，而这种能源的可再生性使其特别具有吸引力。Second,hydrogen-basedfuelcellsareattractivebecausetheywillsolvemanyoftheworld’spollutionproblems.Anunavoidableby-productofburningoiliscarbondioxide
6、,andcarbondioxideharmstheenvironment.Ontheotherhand,theonlybyproductoffuel-cellenginesiswater.第二，氢燃料电池发动机还可以在全球范围内解决污染问题，这也是其具有吸引力的原因。使用石油不可避免的副产品就是二氧化碳，这是对环境有害的气体。而与此同时，燃料电池发动机唯一的副产品就是水。Third,fuel-cellengineswillsoonbeeconomicallycompetitivebecausepeoplewillspendlessmoneytoopera
7、teafuel-cellenginethantheywilltooperateaninternal-combustionengine.Thisistrueforonesimplereason.Afuel-cellautomobileisnearlytwiceasefficientinusingitsfuelasanautomobilepoweredbyaninternal-combustionengineis.Inotherwords,thefuel-cellpoweredcarrequiresonlyhalfthefuelenergythatthein
8、ternal-combustionpoweredcardoestogothesa
