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.
可是，反应堆失去了包括应急柴油发电机在内的所有电力供应，冷却系统无法工作。
But cooling was unavailable as the reactors lost all electric power, including from backup emergency diesel generators.
在海啸到来之前，核电站里的冷却系统是由柴油发电机发动的，[为了补偿]地震后外部能源的缺损。
Before the tsunami hit, the cooling system was operated by diesel generators in the plant [to compensate for] a loss of external power sources after the earthquake.
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