to

5665 篇文章
for they can look forward to the end of winter
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for they can look forward to the end of winter 因为可以期待冬天的结束

Their only hope is to turn and face their pursuers.
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Their only hope is to turn and face their pursuers. 它们唯一的希望是转身直面对方

...the pack needs to get them moving.
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...the pack needs to get them moving. 狼群得让野牛群动起来

To split up the herd...
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To split up the herd... 为了分散野牛群

as grass is hard to find beneath the snow.
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as grass is hard to find beneath the snow. 因为冰雪之下很难找到草

they need little energy to keep warm...
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they need little energy to keep warm... 所以它们不需要多少能量 就能保持温暖

that would bring life to the brink of extinction.
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that would bring life to the brink of extinction. 将生命推向灭绝边缘

it has been too warm for ice to form.
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it has been too warm for ice to form. 温度都太高 无法形成冰冻

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

to become a global power.
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to become a global power. 变成了世界霸主