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TOEFL IELTS BNC: 5127 COCA: 5952

a device that opens and closes to control the flow of liquids or gases, or a similar structure in the heart and the veins that controls the flow of blood阀;活门;(心脏或血管的)瓣膜

The valve failed to open/close.阀门打不开/关不上了。
It was a weak heart valve that caused her death.是心瓣膜问题导致了她的死亡。

part of a musical instrument such as a trumpet that changes the sound by controlling the flow of air(喇叭等乐器的)阀键,活塞


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