- At the same time as bats were first moving into the air,
在蝙蝠首次上天的同时 - other mammals were moving into the sea...
另一些哺乳动物则正在下海 - ...attracted by the abundance of food hidden beneath the waves.
它们被海浪之下的丰富食物所吸引 - The mammals' journey into the oceans was a gradual one.
哺乳动物进入海洋的过程是渐进式的 - These are Maiacetus,
这是慈母鲸 - two-and-a-half-meter-long ancestors of the whales.
身长2.5米 是鲸的祖先 - But unlike whales, they still spend much of their time lazing on land.
但与鲸不同 它们多数时间仍懒洋洋地躺在陆地上
The mammals' journey into the oceans was a gradual one. 哺乳动物进入海洋的过程是渐进式的
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