我希望这一次的周年纪念将为野外生物学和古生物学造成新的推动力来回答这样的问题。
I hope that this anniversary will result in a new impetus for field-based biology and palaeontology to answer such questions.
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。
Paleontological studies show that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic.
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