water hammer

water-hammer的词性：
n.（名词）

1. A banging noise heard in a water pipe following an abrupt alteration of the flow with resultant pressure surges.
水锤，水击：因水流的突然改变及随之的压力升高而在水管中听到的冲击声

2. A banging noise in steam pipes, caused by steam bubbles entering a cold pipe partially filled with water.
水锤声：蒸汽泡进入部分充水的冷管而在蒸汽管中产生的震动声