这些化石看起来像海豚，它们肯定像海豚一样在水中生活。
The fossils look like dolphins and they surely lived like dolphins, in the water.
在前三个阶段中，蚊子都是在水中生活，以水藻和其他微生物为食，并且必须定期游到水面呼吸空气。
During the first three stages, they live entirely in water.During the larva stage, they feed on algae and other microorganisms and must frequently bob to the surface of the water to get air.
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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