新托福TPO 9综合写作详细解析：氢燃料
<p> 阅读材料：</p><p> <span word="Car">Car</span> <span word="manufacturers">manufacturers</span> <span word="and">and</span> <span word="governments">governments</span> <span word="have">have</span> <span word="been">been</span> <span word="eagerly">eagerly</span> <span word="seeking">seeking</span> <span word="a">a</span> <span word="replacement">replacement</span> <span word="for">for</span> <span word="the">the</span> <span word="automobiles">automobiles</span> <span word="main">main</span> <span word="source">source</span> <span word="of">of</span> <span word="power">power</span>, <span word="the">the</span> <span word="internal">internal</span>-<span word="combustion">combustion</span> <span word="engine">engine</span>. <span word="By">By</span> <span word="far">far</span>, <span word="the">the</span> <span word="most">most</span> <span word="promising">promising</span> <span word="alternative">alternative</span> <span word="source">source</span> <span word="of">of</span> <span word="energy">energy</span> <span word="for">for</span> <span word="cars">cars</span> <span word="is">is</span> <span word="the">the</span> <span word="hydrogen">hydrogen</span>-<span word="based">based</span> <span word="fuel">fuel</span>-<span word="cell">cell</span> <span word="engine">engine</span>, <span word="which">which</span> <span word="uses">uses</span> <span word="hydrogen">hydrogen</span> <span word="to">to</span> <span word="create">create</span> <span word="electricity">electricity</span> <span word="that">that</span>, <span word="in">in</span> <span word="turn">turn</span>, <span word="powers">powers</span> <span word="the">the</span> <span word="car">car</span>. <span word="Fuel">Fuel</span>-<span word="cell">cell</span> <span word="engines">engines</span> <span word="have">have</span> <span word="several">several</span> <span word="advantages">advantages</span> <span word="over">over</span> <span word="internal">internal</span>-<span word="combustion">combustion</span> <span word="engines">engines</span> <span word="and">and</span> <span word="will">will</span> <span word="probably">probably</span> <span word="soon">soon</span> <span word="replace">replace</span> <span word="them">them</span>.</p><p> 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。</p><p> <span word="One">One</span> <span word="of">of</span> <span word="the">the</span> <span word="main">main</span> <span word="problems">problems</span> <span word="with">with</span> <span word="the">the</span> <span word="internal">internal</span>-<span word="combustion">combustion</span> <span word="engine">engine</span> <span word="is">is</span> <span word="that">that</span> <span word="it">it</span> <span word="relies">relies</span> <span word="on">on</span> <span word="petroleum">petroleum</span>, <span word="either">either</span> <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="gasoline">gasoline</span> <span word="or">or</span> <span word="diesel">diesel</span> <span word="fuel">fuel</span>. <span word="Petroleum">Petroleum</span> <span word="is">is</span> <span word="a">a</span> <span word="finite">finite</span> <span word="resource">resource</span>, <span word="someday">someday</span>; <span word="we">we</span> <span word="will">will</span> <span word="run">run</span> <span word="out">out</span> <span word="of">of</span> <span word="oil">oil</span>. <span word="The">The</span> <span word="hydrogen">hydrogen</span> <span word="needed">needed</span> <span word="for">for</span> <span word="fuel">fuel</span>-<span word="cell">cell</span> <span word="engines">engines</span> <span word="cannot">cannot</span> <span word="easily">easily</span> <span word="be">be</span> <span word="depleted">depleted</span>. <span word="Hydrogen">Hydrogen</span> <span word="can">can</span> <span word="be">be</span> <span word="derived">derived</span> <span word="from">from</span> <span word="various">various</span> <span word="plentiful">plentiful</span> <span word="sources">sources</span>, <span word="including">including</span> <span word="natural">natural</span> <span word="gas">gas</span> <span word="and">and</span> <span word="even">even</span> <span word="water">water</span>. <span word="The">The</span> <span word="fact">fact</span> <span word="that">that</span> <span word="fuel">fuel</span>-<span word="cell">cell</span> <span word="engines">engines</span> <span word="utilize">utilize</span> <span word="easily">easily</span> <span word="available">available</span>, <span word="renewable">renewable</span> <span word="resources">resources</span> <span word="makes">makes</span> <span word="them">them</span> <span word="particularly">particularly</span> <span word="attractive">attractive</span>.</p><p> 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。</p>
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