可用三种燃料的发动机 trifuel engine
这因为这样，圣地亚哥大学和国内周边的研究人员正在致力于开发第三代生物燃料，这种燃料能直接代替现行的汽油、柴油和喷气式发动机燃料。
Because of this, researchers at SDSU and around the country are pushing ahead to develop third generation biofuels that could be used as direct replacements for gasoline, diesel or jet fuel.
第三，因为燃料电池发动机的使用费用比内燃机发动机低，燃料电池发动机很快就会在价格上很有竞争力了。
Third, fuel-cell engines will soon be economically competitive because people will spend less money to operate a fuel-cell engine than they will to operate an internal-combustion engine.
第三，当你知道制造燃料电池发动机有多贵的时候，你就不会认为使用它省钱了。
Third, there won't necessarily be any cost savings when you consider how expensive it is to manufacture the fuel-cell engine.
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