| 单词 | Paleogene | 
| 释义 | Pa·le·o·gene   (pālē-ə-jēn′) n.  The oldest of two subdivisions of the Tertiary Period, from about 66 to about 23 million years ago, and including the Paleocene, Eocene, and Oligocene Epochs. [German Paläogen : paläo-, paleo- + -gen, -gene.] | 
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