ventral sac

例句：

1. 1. The ventral sac is a small, hidden pocket in the body.
   腹膜囊是身体中的一个小而隐蔽的口袋。
2. 2. During surgery, the surgeon carefully removes the ventral sac to avoid damaging the organs.
   在手术中，外科医生小心地移除腹膜囊以避免损坏器官。
3. 3. The ventral sac plays a crucial role in maintaining the balance of the body's internal organs.
   腹膜囊在保持体内器官平衡方面起着至关重要的作用。