英英释义
Noun- from 63 million to 58 million years ago; appearance of birds and earliest mammals
例句
用作名词(n.)- Paleontological studies showed that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic.古生物学研究表明，现生鸟类的最早出现是在古新世，而爆发性辐射演化发生在新生代早期。
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