Third, there won't necessarily be any cost savings when you consider how expensive it is to manufacture the fuel-cell 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。

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By far, the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, which USES hydrogen to create electricity that, in turn, powers the car.

目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。

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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，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。

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It is powered by a hydrogen fuel-cell engine, which converts hydrogen gas into energy.

NPR: On the Road with GM's Newest Hydrogen Car

But a fuel-cell engine is more than a stack of cells.

ECONOMIST: Fuel cells hit the road | The

But if it is to become the Intel of the industry, making the components at the heart of the fuel-cell engine, it still has an awful lot of work to do.

ECONOMIST: Fuel cells: Intel on wheels | The