endometrium

例句：

1. 1.The endometrium plays a crucial role in the development of the fetus.
   子宫内膜在胎儿发育中起着至关重要的作用。
2. 2. During menstruation, the endometrium undergoes significant changes.
   月经期间，子宫内膜会发生显著变化。
3. 3. Endometrial cancer is a rare but serious type of cancer that affects women.
   子宫内膜癌是一种罕见的但严重的癌症，影响女性。