and

4265 篇文章
And they are annoyingly persistent.
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And they are annoyingly persistent. 顽固地令人厌烦

and it could sustain her for days.
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and it could sustain her for days. 这顿美餐能让她支撑数日

It's winter, and food is desperately short.
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It's winter, and food is desperately short. 时至冬季 食物极度匮乏

All it can do is wait for one to slip and fall.
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All it can do is wait for one to slip and fall. 只能等待某只羱羊失蹄跌落

and they're now almost as sure-footed as their parents.
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and they're now almost as sure-footed as their parents. 现在几乎可以和双亲一样如履平地了

And it certainly can't follow them up here.
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And it certainly can't follow them up here. 显然它也无法追上峭壁

they have had to adapt both their body and their behaviour in order to survive.
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they have had to adapt both their body and their behaviour in order to survive. 为了生存 他们必须从体型和行为上 充分适应环境

Lethally cold, scoured by gales and blizzards,
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Lethally cold, scoured by gales and blizzards, 在极端低温与暴风雪的洗礼下

and only the toughest animals can endure.
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and only the toughest animals can endure. 只有生命力最顽强的动物可以忍受

but, for one and a half million penguins,
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but, for one and a half million penguins, 但是对于一百五十万只企鹅来说