英语词汇“index fossil”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	index fossil
释义	index fossil noun : a fossil that is usually of narrow time range and wide spatial distribution and that is used in the identification of related geologic formations (as in locating new petroleum reserves)
随便看	rollback roll bar roll book roll cage roll call roll-call roll ceiling roll-cumulus rolled rolled rolled barley rolled glass flagging flagging iron flaggingly flaggy flagitate flagitation flagitious flagitiously flagitiousness flag law flag lieutenant flag lily flag line

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