Hydrogen in the steam is believed to have mixed with oxygen, causing the two explosions.

据信，蒸汽中的氢气混合了氧气，导致了这两次爆炸。

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The venting process triggered the explosion when combustible hydrogen released by the steam mixed with oxygen in the air, officials said.

日本官员说，正是被释放的蒸汽包含的可燃氢气在接触到大气中的氧气后，导致了那次爆炸。

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Even hydrogen optimists concede that the reliance on hydrogen from steam reformation is not viable in the long term.

甚至氢乐观者也承认长期来看依靠从蒸汽重组获得氢也不太切实可行。

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Engineuity, a company started by Amnon Yogev, has reportedly developed a method for vehicles to "produce their own fuel" using metals such as magnesium and aluminum to create hydrogen and steam.

ENGADGET: Engineuity developing hydrogen-creating, emission free vehicle

"Economics dictates that 95% of current U.S. hydrogen is produced by steam-methane re-forming of non-renewable natural gas, " Michael K. Heiman, professor of environmental studies at Dickinson College, wrote in a study of the proposed hydrogen economy last year.

FORBES: Magazine Article

Hydrogen is conventionally produced by steam reforming natural gas, a process that wastes some of the energy stored in the gas while releasing large amounts of CO2.

FORBES: Could Hydrogen Breakthrough Revive The Fuel-Cell Car?