| 单词 | amnion |
| 释义 | amnion ['æm.ni.ən] noun countable (plural amnions or amnia) specialized ■a bag made of thin skin which contains amniotic fluid and surrounds the embryo of a mammal, bird or reptile inside its mother （哺乳动物、鸟类或爬行动物胎儿的）羊膜 |
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