心脏瓣膜的

例句：

1. 1. The atrial appendage is the small sac that connects the atria to the ventricles.
   心房附属结构是连接心房和心室的小囊。
2. 2. During heart surgery, surgeons often need to repair damaged atrial tissue.
   在心脏手术中，外科医生经常需要修复受损的心房组织。
3. 3. Atrial fibrillation is a type of irregular heartbeat that occurs in the atria.
   房颤是一种不规则心跳，发生在心房。