...The emergence and extinction time Dinosaurs firstly appeared at about 204 million years ago, the Triassic Period(三叠纪). In the late Mesozoic(中生代), many creatures died as well as dinosaurs.
双语例句
1
This was towards the end of theTriassicperiod.
那时已是三叠纪末期。
2
Dinosaurs first appear in the fossil record during theTriassicperiod, 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。
3
Conodonts went extinct at the end of theTriassicPeriod, about the time dinosaurs were evolving.