Fuel cells have long promised pollution-free driving , but have been held back by their enormous cost when applied to a normal car .
燃料电池长期预示着无污染驾驶，但是当它被应用到一辆普通车上时，因其巨额的成本，举步维艰。
Fuel cells have long promised pollution-free driving , but have been held back by their enormous cost when applied to a normal car .
燃料电池长期预示着无污染驾驶，但是当它被应用到一辆普通车上时，因其巨额的成本，举步维艰。
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