adj.鴨嘴形的
n.鴨嘴獸
New evidence, however, challenges that theory.The duckbill platypus, it turns out, gets about eight hours of REM shuteye a day. 新證據(jù)向上述觀點(diǎn)提出挑戰(zhàn)，它推翻了鴨嘴獸一天睡眠八小時(shí)的理論。
