名词

1. The exhaust valve on my car has burnt out three times.
我车子上的排气阀已烧坏三次。

2. The valves of the heart allow the blood to pass in one direction only.
心脏的瓣膜使血液只能朝一个方向流动。

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.

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

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