Dinosaurs first appear in the fossil record during the Triassic period, some 230m years ago.
根据化石记载,恐龙最早出现在三叠纪期间,也就是大约2亿3000万年以前。
Conodonts went extinct at the end of the Triassic Period, about the time dinosaurs were evolving.
牙形刺在三叠纪末期灭绝了,这正是恐龙开始演化的时代。
This was towards the end of the Triassic period.
那时已是三叠纪末期。
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