单词：amniotic membrane
amniotic membrane的用法和样例：
例句
- One outer membrane envelops both amniotic sacs.两个羊膜囊由一个外膜层包裹。
- Amniocentesis is the removal of fluid from the amniotic sac.羊膜穿刺术是从羊膜囊抽取羊水的技术。
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