日本官员说，已确认至少20人在地震中死亡，多人受伤。

Officials said at least 20 people were killed and many are injured.

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有一个危险的地震灾区的第二次爆炸党首福岛瑞穗电站，日本官员说。

There is a risk of a second explosion at the quake-hit Fukushima power station, Japanese officials have said.

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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。

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

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