and

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and there's no food on these nursery slopes.
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and there's no food on these nursery slopes. 而这片产仔的斜坡上没有一点食物

and spring is advancing rapidly.
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and spring is advancing rapidly. 春色匆匆

Being so small, the cubs are easily chilled and they will be more comfortable resting in the den.
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Being so small, the cubs are easily chilled and they will be more comfortable resting in the den. 幼小的熊崽很容易冻僵 躲在洞穴中可能会更舒服些

And she must get there before the ice breaks up.
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And she must get there before the ice breaks up. 因此它必须在冰层破碎之前到达那里

and the cubs must have the shelter of the den.
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and the cubs must have the shelter of the den. 熊崽们必须回到洞中避寒

the only food the cubs have known since they were born deaf and blind beneath the snow some two months ago.
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the only food the cubs have known since they were born deaf and blind beneath the snow some two months ago. 自从熊崽们两个多月前又聋又瞎地 在雪下出生以来 母乳就是它们唯一的食物

and has lost half her body weight.
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and has lost half her body weight. 失去了一半的体重

and eager to reach their mother,
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and eager to reach their mother, 急切盼着来到母亲身旁

and light returns to the high Arctic,
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and light returns to the high Arctic, 阳光重返北极腹地

and kept warm beneath the downy bulge of its stomach.
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and kept warm beneath the downy bulge of its stomach. 依靠耷拉下来的肚皮上的绒毛保持温暖