| 单词 | index fossil |
| 释义 | index fossil (once / 3939771 pages) n WORD FAMILY index fossil: index fossils n a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found Syn|Hyper guide fossil fossil the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil |
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英语词典包含147318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。