名词
中文翻译：羊膜
同义词：
['maternal membrane', 'amniotic sac']
例句：
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1. The fetus is protected bythe amniotic sac during pregnancy.
胎儿在怀孕期间被羊膜囊保护。
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2.During labor, the amniotic sac expands to help deliver the baby.
分娩时，羊膜囊会扩张以帮助分娩。
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3. Maternal health isclosely linked to the health of the fetus and the development of the placenta.
母体健康与胎儿及胎盘的发展密切相关。