基本解释[生物學]胎囊英汉例句雙語例句The chorion and amnion are foetal membranes that contribute to the placenta and the foetal sac respectively.羢毛膜和羊膜是分別形成胎磐和羊膜囊的胎膜組織。foetal sac更多例句专业释义生物學胎囊