单词	index fossil
释义	index fossil noun : a fossil usually with a narrow time range and wide spatial distribution that is used in the identification of related geologic formations Example Sentences Recent Examples on the Web Pappas reports that Agnostus is a great index fossil. Jason Daley, Smithsonian, 19 Sep. 2017 Word History First Known Use 1900, in the meaning defined above
随便看	sackful sackfuls sacking sacking out sackings sackless sizzlings siĕmréab SJ sjaellandes sjaellands sjambok sjamboked sjamboking sjambokked sjambokking sjamboks SJC sjogrenite sjt Sjælland SK ska ska, re skaamoog

英语词典包含469781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。