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	calamar calamari calamariaceae calamariaceous calamarian calamary calamata calambac calambour calami calami- calami calamine calamine calamine blue calamint calamint calamint balm calamistrum calamitaceae calamite calamitean calamites calamitoid calamitous

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