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	expurgate expurgated expurgates expurgating expurgation expurgations expurgator expurgatorial expurgators expurgatory expwy exquisite exquisitely exquisiteness exquisitenesses exquisites exquisitively exr exradius exrx exsanguinate exsanguinated exsanguinates exsanguinating exsanguination

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