And while hydrogen is touted as the fuel of the future, at best it is decades away.

而且，虽然氢气被吹捧为未来的燃料，但按照最乐观的估计，这也是几十年后的事了。

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Natural gas is considered as one of the potential fuels for engine while hydrogen is considered as one of the cleanest fuels for engine.

天然气和氢气被认为是最有潜力和最清洁的发动机替代燃料。

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Mister Zundt says a hydrogen bus will last an average of twenty years, while a diesel bus can be used for five to eight years.

VOA: special.2009.09.07

The first launch attempt was postponed after technicians discovered a hydrogen leak while the ship was on the launch pad.

VOA: standard.2009.06.16

He said technicians are confident that they have fixed the hydrogen leak, which was found while NASA crews were filling the shuttle's external fuel tank.

VOA: standard.2009.06.16

All-electrics are next in line while hydrogen-fueled vehicles are a few car lengths behind.

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While the production of hydrogen results in lost energy, Pivovar says that the use of hydrogen in a fuel cell vehicle provides much more oomph than gasoline.

FORBES: Hydrogen-Powered Vehicles Could Emerge From Traffic

The company's U.S. division is working with Wal-Mart to produce 65 forklift trucks that run on hydrogen, while in Germany it's partnering with BMW and a small bus company.

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