Monotremes

基本解釋

Having no placenta, as marsupials and monotremes.
無胎盤的無胎盤的，如有袋目哺乳動物和單孔目動物
Having no placenta,as marsupials and monotremes.
無胎盤的無胎盤的，如有袋目哺乳動物和單孔目動物
All mammals except monotremes and marsupials are placental mammals.
除了單孔類動物和有袋動物之外所有的哺乳動物都是有胎盤的哺乳動物。
The world's only monotremes are the platypus and the echidna.
鴨嘴獸和針鼴鼠是世界上唯一的單孔類動物。
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.
溫血脊椎動物，皮膚表層有或多或少的毛發(fā)，除單孔目動物之外其新生幼體都是活的并靠乳汁滋養(yǎng)。