...恐龙灭绝[gap=1717]ords: Jiayin County, Heilongjiang; sporopollen; Late Cretaceous; climate change; mass extinction of dinosaurs...
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Research scientists have shown the meteorite hit the earth about 30 million years earlier than the mass extinction of dinosaurs.
科学家们的研究表明，这颗陨石撞上地球的时间要比恐龙大规模灭绝的时间早大约30万年。
Presumably, those environmental disasters could have been responsible for the mass extinction, including the death of the dinosaurs.
据推测，这些环境灾难可能是物种大规模灭绝的成因，包括恐龙的灭绝。
Dinosaurs' high level of fitness could also explain why mammals remained so small until the mass extinction of the dinosaurs 65 million years ago.
恐龙的高度适应性可能也解释了为什么哺乳动物的体型总是那么小，这种情况一直持续到六千五百万年前恐龙大规模灭绝。
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