1886Athenæum 9 Oct. 471/1 Among extinct ungulates there are two types of foot-structure—one adaptive, such as is seen to-day, and one inadaptive.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。