32 篇文章
society became more complex...
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society became more complex... 社会变得更加复杂

bison became the focus of another group of survivors.
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bison became the focus of another group of survivors. 野牛成为另一群幸存者的重点目标

and quickly became home to an incredible wealth of animal life.
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and quickly became home to an incredible wealth of animal life. 很快成为大批动物的家园

Rainfall became more regular...
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Rainfall became more regular... 降雨变得更频繁

the land became increasingly dry.
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the land became increasingly dry. 陆地变得越发干燥

the tundra-steppe became Earth's most extensive habitat.
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the tundra-steppe became Earth's most extensive habitat. 冻原成为地球上最广阔的栖息地

it became a tinderbox.
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it became a tinderbox. 地球变得一点就着

Some became enormous.
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Some became enormous. 有一些变得很庞大

Food became more spread out,
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Food became more spread out, 食物变得更分散

it became a harsher, more difficult place to live.
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it became a harsher, more difficult place to live. 它成为了 一个更恶劣、更难以生存的地方