| 词汇 | Eocene |
| 词根词缀 | 词源： "second epoch of the Tertiary Period," coined in Eng. 1831, from Gk. eos "dawn" (see eohippus) + kainos "new" (see recent); along with Miocene and Pliocene, by the Rev. William Whewell (17941866), Eng. polymath. |
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