noun 下载 🔗分享 羊膜,包膜。 The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended. Examples : "The doctor explained that the amnion, a protective sac filled with fluid, cushions the baby inside the womb. " 医生解释说,羊膜就像一个充满液体的保护袋,在子宫里缓冲保护着宝宝。 biology anatomy medicine organ organism 与AI对话词汇游戏阅读练习