But the promise of hydrogen-powered personal transport seems as elusive as ever.

但是氢动力个人交通工具的前景看起来和以往一样扑朔迷离。

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The futuristic sports car is a hydrogen-powered, zero emission, fuel-celled supercar.

这部未来风格的跑车是一部氢动力零排放燃料电池超级汽车。

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Boeing, for one, has a hydrogen-powered UAV called the Phantom Eye that will fly for four days at 20,000 metres (66,000 feet).

例如，波音已经开发了一款名为“幽灵之眼”的氢动力无人飞行器，它能够在20000米(66000英尺)高空连续飞行四昼夜。

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Meanwhile, students at the University of Birmingham recently built the UK's first hydrogen-powered locomotive.

ENGADGET: Inhabitat's Week in Green: a locomotive that runs on hydrogen, honey detective and a 30 mph-capable hover bike

Even more important, the plasmatron could speed the long- awaited transition to hydrogen-powered fuel-cell vehicles.

FORBES: Technology

The budget for hydrogen-powered vehicles, once the darlings of the alternative-energy lobby, has been slashed.

ECONOMIST: Face value