| 释义 |
〔rhea〕Any of several flightless South American birds of the genusRhea, resembling the ostrich but somewhat smaller and having three toes instead of two. 美洲驼：任一种不会飞的南美美洲驼属 类的鸟，类似驼鸟但小一些，并且具有三趾而非两趾 〔chalicothere〕Any of various extinct ungulate mammals of the Eocene to Pleistocene epochs, having distinctive three-clawed, three-toed feet.爪兽：一种已灭绝的始新世和更新世的有蹄哺乳动物，其特征为有三爪，每爪有三趾 |