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Their mother has not eaten for five months and has lost half her body weight.
它們的母親已有5個月沒有進食了，失去了一半的體重
Now she converts the last of her fat reserves into milk for her cubs.
現在它將僅剩的一點脂肪變成乳汁喂養(yǎng)它的寶貝們
The spring sun brings warmth but also a problem for the mother.
春天的太陽帶來了溫暖，但對母熊而言卻是一個問題
It starts to melt the sea ice.
海面的冰層開始融化
That is where she hunts for the seal she needs to feed her cubs.
而母熊則需要在那里捕殺海豹，喂養(yǎng)幼熊
And she must get there before the ice breaks up.
因此它必須在冰層破碎之前到達那里
For now though it's still minus thirty degrees and the cubs must have the shelter of the den.
而現在的氣溫仍然有-30℃，熊崽們必須回到洞中避寒
It's six days since the bears emerged and spring is advancing rapidly.
現在是北極熊現身后的第6天，春色匆匆
But even now blizzards can strike without warning.
但即使是現在，暴風雪仍會在毫無征兆的情況下來襲
Being so small, the cubs are easily chilled and they will be more comfortable resting in the den.
幼小的熊崽很容易凍僵，躲在洞穴中可能會更舒服些
But their mother must keep them out and active.
可是母熊必須得把它們帶到外邊活動
She's becoming weak from hunger and there's no food on these nursery slopes.
饑餓將它折磨得虛弱不堪，而這片產仔的斜坡上沒有一點食物
