1. 初蜕：amnion 羊膜 | amnios 初蜕 | amniota 羊膜类,羊膜动物
1. Tell him that amnios are dangerous this early onin the pregnancy.
跟他说 在怀孕初期抽取羊水是很危险的
noun
1. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
Synonym: amnion amniotic sac