- and today inhabit all but the coldest oceans.
如今栖息在 除最冷的海洋之外的所有海洋中 - Yet once a year,
但是成年雌海龟 - adult females must still return to dry land to lay their eggs.
每年仍要返回干燥的陆地上产卵 - Here, on the edge of the Great Barrier Reef...
在大堡礁的边缘 - 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