noun · a general container or storage vessel for holding water

楼顶上的不锈钢水箱需要定期清洗。

noun · a plumbing tank used to store water for specific fixtures, such as a toilet or washbasin

马桶的水箱配件坏了，导致水流不止。

noun · a cooling device for an internal combustion engine in a vehicle

我的汽车水箱漏水了，引擎温度很高。