and

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and produces so much oxygen
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and produces so much oxygen 产生了大量氧气

and the sun does not set.
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and the sun does not set. 不会出现日落

and not enough of their energy reaches the ground to enable trees to grow.
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and not enough of their energy reaches the ground to enable trees to grow. 到达地面的能量很少 并不足以支持树木生长

and now it's easier to target an individual.
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and now it's easier to target an individual. 狼群便更容易锁定单个目标

And they are hungry.
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And they are hungry. 它们已是饥肠辘辘

Newborn calves have to be up and running the day they are born.
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Newborn calves have to be up and running the day they are born. 新生的小鹿必须 在出生的第一天就站起来奔跑

and the thawing shifting landscape.
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and the thawing shifting landscape. 融化的冰雪不断改变着地貌

and they're only just in time,
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and they're only just in time, 它们刚好赶得及

and the mother has led her cubs a mile from the den.
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and the mother has led her cubs a mile from the den. 母熊已经带领幼熊离巢1英里远

But their mother must keep them out and active.
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But their mother must keep them out and active. 可是母熊必须得把它们带到外边活动