leaflet

/ˈliflət/

a thin triangular flap of a heart valve

中文释义：小叶；瓣

The surgeon carefully repaired the damaged leaflet of the heart valve.

外科医生小心地修复了心脏瓣膜受损的小叶。

Each leaflet of the mitral valve opens and closes with each heartbeat.

二尖瓣的每个小叶随着每次心跳开合。