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单词 monotreme
释义 monotreme
 /mon"euh treem'/,  n.  
 any animal of the Monotremata, the most primitive order of mammals, characterized by certain birdlike and reptilian features, as hatching young from eggs, and having a single opening for the digestive, urinary, and genital organs, comprising only the duckbill and the echidnas of Australia and New Guinea.
 [1825-35; < F monotrème < NL monotrema, assumed sing. of Monotremata, neut. pl. of MONOTREMATUS MONOTREMATOUS]
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