- 释义：
- n. （生物）囊，液囊
- 例句：
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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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The peritoneal cavity is a closed sac.
腹膜腔是一个封闭的囊腔.
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The heart sounds are muffled when the pericardial sac is distended with fluid.
当心包充满液体时心音减弱.
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