- they come together in their thousands.
它们成千上万结伴而来 - Aggregations like this
数百万年来 - 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
There's a good reason for this gathering. 如此聚集是有原因的
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