基本解释[生物学]胎囊英汉例句双语例句The chorion and amnion are foetal membranes that contribute to the placenta and the foetal sac respectively.绒毛膜和羊膜是分别形成胎盘和羊膜囊的胎膜组织。foetal sac更多例句专业释义生物学胎囊