羊膜囊（amniotic sac）的内部是羊膜（amnion），羊膜里面装着羊水（amniotic fluid）；羊膜囊的外部则是绒毛膜（chorion），装着羊膜，属于胎盘的一部分...
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The amniotic sac breaks and is expelled in the third stage of labor.
在第三产程，羊膜囊破裂并被排出。
A protective fluid-filled amniotic sac encloses and cushions the fetus.
充满液体的羊膜包裹并保护胎儿缓和震动。
Worse was to come when tests also confirmed a tear in the amniotic sac, which meant the waters were leaking.
更糟糕的是，他们还检测到，羊膜囊也破裂了，羊水开始外流。
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