Other Japanese automakers have been working to create fuel cell cars, which produce electricity through a chemical reaction between hydrogen and oxygen, with water the only by-product.

其它日本汽车制造商已经开始着手制造燃料电池汽车，这种汽车通过氧和氢的化学反应来发电，而这种化学反应的副产品只有水。

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The hydrogen and oxygen, separated and on-hand, can be used to power a fuel cell whenever energy is needed.

把氢气和氧气分开存放，这样在需要能源时就可用它们来驱动燃料电池。

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It is a car that stores hydrogen on board, and, mixing the hydrogen and atmospheric oxygen in the fuel cell stack, creates electricity, said Mittleman.

这种汽车可以将氢储存在车上，然后将氢和大气中的氧气在电池箱中混合，产生电力。

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"If you turn the experiment around and put the hydrogen and oxygen in and take the electricity off, you have a fuel cell, " Roan said.

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In the simplest terms, a fuel cell combines hydrogen and oxygen in a process that releases electricity, heat and water.

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Fuel cell electric vehicles generate their power from hydrogen and oxygen, and emit only water.

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