mammal [ˈmæml]

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n.哺乳动物

any animal of which the female gives birth to babies , not eggs , and feeds them on milk from her own body

A whale is a kind of mammal. 鲸是一种哺乳动物。
The bat is the only mammal that can fly. 蝙蝠是唯一会飞的哺乳动物。