瓣膜英语为"valve"。

瓣膜是生物体内用来控制液体流动的一种组织，如心脏中的瓣膜，用来控制血液流动。瓣膜这一词源于拉丁文"valva"，意为"门闩"或"阀门"。

例句：

The heart has four valves that control the flow of blood through the chambers of the heart. (心脏有四个瓣膜控制血液流动。)

The doctor said that I have a leaky valve in my heart. (医生说我的心脏有个漏气的瓣膜。)

The valve in the pipe is used to control the flow of water. (管子里的阀门用来控制水流。)