- have been one of nature's greatest spectacles for millions of years.
这样的聚集 一直是自然界最壮丽的奇观之一 - There's a good reason for this gathering.
如此聚集是有原因的 - Safety in numbers.
龟多更安全 - Turtles first evolved back in the Triassic.
海龟最早是在三叠纪时期进化而来 - 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 - At eight meters long, this is a plesiosaur.
这只蛇颈龙身长八米 - It, too, is a reptile,
它也是爬行动物
Turtles first evolved back in the Triassic. 海龟最早是在三叠纪时期进化而来
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