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But when new born, each cub weighs just six hundred grams.
而每只幼崽剛出生時(shí)體重都只有約六百克。
They have no subcutaneous fat and will not survive exposure to the Arctic conditions above ground.
它們沒(méi)有皮下脂肪，因此如果暴露在北極地面環(huán)境下將無(wú)法存活。
The family will remain in their den until March when the cubs are big enough to venture outside.
北極熊一家將在洞中一直呆到三月到來(lái)，那時(shí)幼崽們已經(jīng)長(zhǎng)大得足夠外出闖蕩了。
Inside the den, it's a snug zero degree Celsius.
洞中的溫度是感覺(jué)舒適的零度。
Above ground, without the sun's energy, the temperature has plummeted to minus thirty degree Celsius.
而在地面上，因?yàn)槿狈μ?yáng)的能量，氣溫已經(jīng)急劇下降至零下30攝氏度。
Male polar bears do not hibernate and remain active throughout the winter.
公北極熊不進(jìn)行冬眠，而是在整個(gè)冬季都保持活動(dòng)。
They are solitary animals and each winter they endure months of extreme cold and darkness alone on the sea ice.
它們是獨(dú)居動(dòng)物，而每年冬天，它們都獨(dú)自在海冰上忍受著幾個(gè)月的嚴(yán)寒與黑暗。
By mid February, an end to the long polar winter is insight.
到了二月中旬，北極漫長(zhǎng)的冬季即將結(jié)束。
The sun rises above the horizon in Svalbard for the first time in months.
在斯瓦爾巴德群島的地平線上，幾個(gè)月以來(lái)太陽(yáng)初次升起。
At first, there is less than two hour sunlight each day.
起初，每天只有不到兩小時(shí)的陽(yáng)光。
It will be another month before the days are long enough for the sun's warmth to start melting the froze Arctic Ocean.
還要再過(guò)一個(gè)月時(shí)間，白晝的時(shí)長(zhǎng)才足以讓太陽(yáng)的熱度開(kāi)始融化冰凍的北冰洋。
Small pools have remained open throughout the winter.
有些小洞整個(gè)冬季都不會(huì)凍結(jié)。
These beluga whales became stranded when the ocean turned to ice in autumn.
這些白鯨在秋季海面結(jié)冰時(shí)被困在這里。
Like all mammals, they need to breathe oxygen.
它們與所有哺乳動(dòng)物一樣需要呼吸氧氣。
The small hole on the ice is maintained by their continuous movement as they rise to the surface to breathe.
冰面上的小洞是靠它們探出水面來(lái)進(jìn)行呼吸這樣持續(xù)的運(yùn)動(dòng)才得以維持。
Open water is miles away, and this tiny pool is their lifeline.
開(kāi)闊的水面在幾公里之外，所以這狹小的洞成了它們的生命線。
They must stay near the hole to breathe, but having already exhausted any food supplies nearby, they are starving.
它們必須留在洞附近以維持呼吸，但是它們已經(jīng)耗盡了周圍的食物因此饑餓異常。
The belugas bear horrible scars and they are not caused by the ice but by predators.
白鯨身上帶著可怕的傷痕，但這些并非與冰層碰撞所致而是掠食者留下的。
