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By comparison, getting a conventional internal-combustion engine to burn hydrogen instead of petrol is relatively easy.Even so, such efforts have also come to naught.

相比之下(这里应该是指相比于制造氢燃料电池)，将传统内燃机由烧油改为烧氢气要容易一些。即使是这种尝试也没有结果。

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Eventually, it is hoped, fuel cells running on hydrogen will take the place of the ubiquitous internal combustion engine.

最终情况很有可能是——氢燃料电池取代现在无所不在的内燃机。

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The technology isn't new-a patent for a hydrogen internal combustion engine was issued in 1928, and a 20hp fuel-cell tractor was demonstrated in the late 1950s.

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It's powered by a hydrogen internal combustion engine that turns a 44-kilowatt electric generator that runs eight propellers and whatever communications equipment is loaded on board.

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There is, however, an alternative: burn the hydrogen in a conventional internal-combustion engine.

ECONOMIST: Hydrogen-powered cars