Like carmakers, they are trying to combine internal-combustion engines and electric motors to save fuel.

和汽车制造商一样，他们正试图将内燃机引擎和电动机结合起来以便节省燃油。

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Petrol-electric hybrids attain their fuel economy by using electric motors in stop-start city traffic and petrol engines when cruising on the highway.

汽-电混合动力汽车之所以燃油经济性好，是因为它可以在频繁起步停车的市区行驶时使用电动机，在一般的行驶中使用汽油发动机。

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There are various types of engines such as electric motors, steam engines and internal combustion engines.

有各种各样的发动机，如电动机、蒸汽机和内燃机。

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These electric motors help with acceleration, which means cars can be fitted with smaller and thus cleaner engines.

BBC: Electric motoring: a quiet revolution

On the other hand, this conflation makes far more sense in the long term, as our electrical grid becomes more sophisticated, and as electric vehicles begin the inevitable switch from internal combustion engines to electric motors or some other renewable source of power.

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Hybrids, already being sold by Honda and Toyota by the thousands, use battery-powered electric motors to assist traditional internal combustion engines.

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