cystitome

例句：

1. 1. The cystitome was filled with fluid andhad a hard outer shell.
   这个囊肿被液体充满，有一个硬的外壳。
2. 2. Thecystitome burst, releasingthe trapped air.
   这个囊肿破裂了，释放出被困的空气。
3. 3. The cystitome is a common cause of pain inthe lower back.
   囊肿是下背部疼痛的常见原因。