Valvulae anales

例句：

1. 1. The heart valves are responsible for regulating blood flow.
   心脏瓣膜负责调节血流。
2. 2. The doctor performed a surgery to replace the damaged valve leaflet.
   医生进行了手术来替换受损的瓣叶。
3. 3. The patient was admitted to the hospital with a blocked valve leaflet.
   患者因瓣叶阻塞入院。