valve

noun

1. one of the paired hinged shells of certain molluscs and of brachiopods

2. the entire one-piece shell of a snail and certain other molluscs

3. control consisting of a mechanical device for controlling the flow of a fluid

4. device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone

5. a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

1. 阀;活门
A valve is a device attached to a pipe or a tube which controls the flow of air or liquid through the pipe or tube.

2. （心脏的）瓣，瓣膜
A valve is a small piece of tissue in your heart or in a vein which controls the flow of blood and keeps it flowing in one direction only.

e.g. He also has problems with a heart valve.
他的一个心瓣也有毛病。

3. see also: safety valve

1. valve在线翻译

1. 汽门：因为发动机长时间停止, 起润滑作用的机油会因地心引力而往下流到发动机底部, 发动机在冷车启动时, 位于发动机顶部的凸轮轴(CAM)及汽门(VALVE)润滑较不足, 所以磨损较大.