noun 下载 🔗分享 亚纲，下纲 A zoological classification sometimes inserted below subclass and above superorder. Examples : "In zoology class, we learned that a marsupial belongs to the infraclass Metatheria, which sits between the subclass Theria and the superorder Ameridelphia in the animal classification system. " 在动物学课上，我们学到有袋类动物属于亚纲（或下纲）的后兽亚纲(Metatheria)，它在动物分类系统中位于真兽亚纲(Theria)和美洲有袋总目(Ameridelphia)之间。 biology animal organism science 与AI对话词汇游戏阅读练习
