The major difference between these two power generators is that the chemical energy of the fuel cell is converted directly to electrical power without intermediate conversion first to heat.

主要的区别在于，燃料电池的化学能量能直接转化成电能而不需要先转化成热能。

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When a fuel unites with oxygen, we say the fuel burns; what is really happening is that chemical energy (fuel and oxygen) is changing to heat energy.

当燃料与氧气结合，我们就说燃料开始燃烧了，实际发生的是化学能(燃料与氧气)转化成热能。

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Chemical energy gasoline, fossil fuel can be burned, converted to heat, converted to electricity.

化学能，汽油，矿物燃料能被燃烧，转化成热量，再转化成电。

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That means that low-temperature waste heat can be used to produce high-quality chemical energy hydrogen for the first time.

FORBES: Could Hydrogen Breakthrough Revive The Fuel-Cell Car?