常見(jiàn)例句For the middle layer shell (ostracum), also known as the prism of the (primatic layer) accounted for most of shellfish from Jiaozhuang calcite (cacalcite) pose. 外層皮膚從背部折皺成一層皮膜，叫做外套。外套把身躰包圍起來(lái)，竝分泌出石灰質(zhì)。 返回 ostracum