mam·mal /ˈmæməl/
  哺乳動物
  mam·mal /ˈmæməl/ 名詞
  哺乳動物
  Mam·mal n.; pl. Mammals   Zool. One of the Mammalia.
  Age of mammals. See under Age, n., 8.
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  mammal
       n : any warm-blooded vertebrate having the skin more or less
           covered with hair; young are born alive except for the
           small subclass of monotremes and nourished with milk