- 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 - It's in the water that they come alive...
在水中 它们才会活跃起来 - chasing schools of fish.
追逐鱼群 - His time down here is limited by how long he can hold his breath.
它在水下的时间 受限于它能屏住呼吸的时间
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
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