然而，从某种程度上讲，海龟并没有像鲸鱼或儒艮一样完全回到水中生活，因为它们依旧在海滩上产卵。

However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.

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头开始向左转并回到水中。

The head begins torotate left and flex to return to the water.

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例如，陆地哺乳动物如何回到水中，进化成鲸鱼、海豹和海牛呢？这一问题一直让Fish和他的同事困惑不解。

For instance, how terrestrial mammals moved back into the water and evolved into whales, seals and manatees continues to puzzle Fish and colleagues.

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