词汇 | index fossil |
释义 | index fossil noun [ C ] geology specialized uk/ˈɪn.deks ˌfɒs.əl/ us/ˈɪn.deks ˌfɑː.səl/ 标准化石 a fossil that is found in many places and comes from the same time in history, so that scientists can use it to decide how old certain rocks are |
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