cistern [ˈsɪstən]

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n.贮水池

a container in which water is stored , especially one connected to a toilet or in the roof of a house

The cistern is empty but soon fills again. 蓄水池里现在没水，但不久就会储满水的。
The lavatory cistern overflowed. 厕所水箱的水溢出来了