Hybrid technology, combining electric batteries with a petrol-driven back-up engine, is well established.

混合动力技术，(结合了电力电池盒汽油驱动的后备引擎)已经确立。

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That's because this version of the WAIEX is not powered by a combustion engine. It's USES batteries.

原因是这种Waiex飞机不靠燃烧引擎驱动，而是使用电池。

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While super-gentle acceleration keeps the vehicle in electric-only mode, it also drains the batteries quickly, often causing the gasoline engine to come on just to recharge the battery pack.

当车辆在非常缓慢的加速过程中将只使用电能，同时电量消耗非常快，常常会使汽油发动机随后只为电池组充电而启动。

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And the Toyota-style hybrid, we have batteries and gasoline engine onboard.

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The interior become an acid bath from leaking engine batteries.

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The Volt will have a small petrol-engine generator to recharge its batteries on trips of more than 65km.

ECONOMIST: Electric cars: Charge! | The