452 篇文章
an unbroken line of ancestry stretching back four billion years
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an unbroken line of ancestry stretching back four billion years 一条绵延40亿年的连续谱系

allowing forests to bounce back.
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allowing forests to bounce back. 令森林得以复苏

But they'll be back.
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But they'll be back. 但它们会回来

They have no choice but to back down
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They have no choice but to back down 它们别无选择 只得退下

...but the cheetah will be back...
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...but the cheetah will be back... 但猎豹还会回来

But back on the surface,
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But back on the surface, 但是在地表

is pulled back to Earth by gravity.
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is pulled back to Earth by gravity. 被地心引力拉回地球

for back at the den...
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for back at the den... 因为在巢穴里

they're able to march back out to war within 24 hours,
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they're able to march back out to war within 24 hours, 它们能够在24小时内再次投入战斗

and carry them back to the nest
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and carry them back to the nest 带回巢穴