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3080 篇文章
Yellowstone is one of the coldest places in America.
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Yellowstone is one of the coldest places in America. 黄石国家公园 是美国最寒冷的地方之一

This is the story of a great freeze
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This is the story of a great freeze 本集讲述的是大冰冻的故事

But there is one more chapter in the mammal story still to be told.
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But there is one more chapter in the mammal story still to be told. 但是哺乳动物的故事 还有一章仍待讲述

Such is the role of chance in the history of life on our planet.
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Such is the role of chance in the history of life on our planet. 这就是机遇在地球生命历史中 所扮演的角色

This is much more than about speed.
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This is much more than about speed. 这不仅仅是速度的问题

But time is running out.
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But time is running out. 但是快没时间了

The Maiacetus is running out of air.
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The Maiacetus is running out of air. 慈母鲸的氧气快用完了

The mammal's intelligence is his only defense...
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The mammal's intelligence is his only defense... 哺乳动物的智慧是它唯一的防御手段

His time down here is limited by how long he can hold his breath.
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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

one in five of all mammal species is a bat.
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one in five of all mammal species is a bat. 所有哺乳动物中有五分之一是蝙蝠