as it was for their prehistoric ancestors. 对于其史前祖先也是如此
But by the time they'd conquered the seas, the ocean was home to deadly predators. 但当它们征服大海时 海洋已经成为致命捕食者的家园
was when some of them turned their back on the land 也许是其中一些动物放弃陆地
This is an echo of what life was like back in the Triassic. 这是三叠纪时期生活的历史回声
Lystrosaurus was the unwitting dodo of its age. 水龙兽成了那个时代的渡渡鸟
it was much larger reptiles who would change the course of history. 即将改变历史进程的 是更大的爬行动物
another group of survivors was on the rise. 又有一群幸存者在崛起