- knowing that safety lies in numbers
它们知道 庞大的数量和即将到来的黑暗 - and in the coming darkness.
能够带来安全 - 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
other mammals were moving into the sea... 另一些哺乳动物则正在下海
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