鸭嘴兽和针鼹鼠是世界上唯一的单孔类动物。
The world's only monotremes are the platypus and the echidna.
澳大利亚短吻针鼹，一单孔类动物，是现存最古老的地球上的哺乳动物之一。
The Australian short-beaked echidna, a monotreme, is one of the oldest living mammals on earth.
因针鼹鼠之独特，被定类为特殊的哺乳动物，属单孔类动物。单孔类动物只有针鼹鼠和鸭嘴兽。
The echidna is such a unique animal that it is classified in a special class of mammals known as monotremes, which it shares only with the platypus.
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