447 篇文章
and civilizations were born.
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and civilizations were born. 文明就此诞生

and sowed their seeds where they were best able to grow.
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and sowed their seeds where they were best able to grow. 并将种子播撒在最适合生长的地方

until they were exactly where they wanted them.
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until they were exactly where they wanted them. 直到它们落入埋伏

the largest land animals were disappearing.
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the largest land animals were disappearing. 最大的陆地动物正在消失

the mammals were faced with a new challenge.
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the mammals were faced with a new challenge. 哺乳动物面临一个新的挑战

other mammals were moving into the sea...
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other mammals were moving into the sea... 另一些哺乳动物则正在下海

At the same time as bats were first moving into the air,
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At the same time as bats were first moving into the air, 在蝙蝠首次上天的同时

But bats were not the first animals to take to the skies.
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But bats were not the first animals to take to the skies. 但蝙蝠并不是第一个上天的动物

But the endless plains were no paradise for the mammals.
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But the endless plains were no paradise for the mammals. 但无尽的平原并不是哺乳动物的天堂

Mammals were now big enough
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Mammals were now big enough 哺乳动物此时已非常庞大