但是海啸冲毁了在冷却系统中使用的备用发电机。
But the tsunami washed out the backup power generators being used in the cooling operation.
首先有一个主冷却系统，然后有一个备用系统，备用系统还有一个备用系统，再有一个备用系统的备用系统，如此下去。
There's the main cooling system, a backup to it, a backup to the backup, a backup to the backup to the backup, and so on.
有官员表示他们寄希望于能够尽快恢复电站的动力供应，以便能够冷却系统和备用发电机。
Officials also said they were hoping that they would restore "as soon as possible" the power supply to the plant, which is needed for the cooling system and back-up generators.
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