a type of mammal from Australasia or South or Central America that is not completely developed when it is born and is carried around in a pouch (= a body part like a pocket) on the mother's body, where it is fed and protected until it is completely developed

Marsupials include koalas, possums, and kangaroos. 有袋目动物包括树袋熊、袋貂和袋鼠。

giving birth to young that are not completely developed when they are born, and that are carried and fed in a pouch on the mother's body

The study sheds light on the genetic differences between placental and marsupial mammals. 这一研究让人了解胎盘哺乳动物和有袋哺乳动物在基因上的差异。