mono·treme /ˈmɑnəˌtrim/
  單孔類動物
  mono·treme /ˈmɑnəˌtrɪm/ 名詞
  Mon·o·treme n.  Zool. One of the Monotremata.
  ◄ ►
  monotreme
       n : the most primitive mammals comprising the only extant
           members of the subclass Prototheria [syn: egg-laying
           mammal]