urocyst

例句：

1. 1.The urocyst is a small sac that stores urine.
   尿囊是一个储存尿液的小囊。
2. 2. The doctor removed the urocyst to relieve his pain.
   医生移除了尿囊以缓解他的疼痛。
3. 3.Urocyst infection can cause severe pain and fever.
   尿囊感染可以引起严重的疼痛和发烧。