mammal
noun [ C ] uk/ˈmæm.əl/ us/ˈmæm.əl/
C1 哺乳动物
any animal of which the female feeds her young on milk from her own body. Most mammals give birth to live young, not eggs.
Humans, dogs, elephants, and dolphins are all mammals, but birds, fish, and crocodiles are not. 人、狗、大象和海豚都是哺乳动物，而鸟、鱼和鳄鱼则不是。