related to the bag and liquid that surround the embryo (= developing young animal) of a mammal, bird, or reptile inside its mother

amniotic fluid 羊水

An amniotic sac, or amnion, contains a foetus during pregnancy. 怀孕期间，胎儿被包裹在羊膜，又称羊膜囊内。

Other researchers have worked on amniotic cells. 其他研究者对羊膜细胞进行了研究。