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The Arctic Circle, a frozen ocean ringed by three continents.
北極圈，一片被三個(gè)大洲環(huán)繞的冰凍的大洋。
Survival here is a constant battle against the planet's most ferocious elements.
求生于此是一場(chǎng)面對(duì)全球最惡劣氣候的持久戰(zhàn)。
One third of the Arctic Ocean is covered in ice all year round and for half a year the sun does not rise above the horizon.
北冰洋三分之一的洋面終年被冰所覆蓋，而有半年的時(shí)間太陽(yáng)都不會(huì)在地平線上升起。
But in summer, the sun never sets.
不過(guò)在夏季，太陽(yáng)卻永不下落。
Thousands of animals head north to reap their field as the shallow seas of the Arctic Circle become some of the richest on earth.
成千上萬(wàn)的動(dòng)物涌向北極，分享那里的饕餮盛宴，而此時(shí)北極圈內(nèi)的淺海區(qū)成為了全球最富饒的地區(qū)之一。
In winter, the Arctic Ocean is almost completely covered in ice.
冬季里北冰洋幾乎完全被冰所覆蓋。
The sea ice grows to encase the northern tips of Asia, Europe, North America, and several islands.
海冰的擴(kuò)張使亞洲歐洲和北美洲的北端以及一些島嶼全都被冰封鎖。
This is one of the most hostile habitats on earth, but the planet's most resilient animals survive above and below the ice.
這是全球環(huán)境最惡略的棲息地之一，然而地球上適應(yīng)力最強(qiáng)的動(dòng)物們卻在冰面上下生存著。
Thousands of whales migrate across the Arctic Ocean search for food.
幾千頭鯨遷徙經(jīng)過(guò)北冰洋尋找食物。
Seals nurse their young and compete for females. And it's home to around twenty thousand polar bears.
海豹們照料著幼崽，并且為求偶而競(jìng)爭(zhēng)。這里還生活著大約兩萬(wàn)頭北極熊。
On the Norwegian island chain of Svalbard, there are more polar bears than people.
在挪威的斯瓦爾巴德群島，北極熊的數(shù)量比當(dāng)?shù)厝丝谶€多。
Svalbard lies entirely within the Arctic Circle, just one thousand kilometers south of the North Pole.
斯瓦爾巴德群島完全在北極圈之內(nèi)，距離北極點(diǎn)僅有一千公里。
From October to February, the sun does not rise above the horizon, and for three and half month each year, Svalbard is enveloped in darkness.
從十月到次年二月，太陽(yáng)都不會(huì)在地平線上升起，而每年有三個(gè)半月時(shí)間斯瓦爾巴德群島都被完全籠罩在黑暗中。
Pregnant polar bears hibernate through the long dark winter.
懷孕的母北極熊會(huì)在漫長(zhǎng)而黑暗的冬季進(jìn)行冬眠。
In a den on the slopes overlooking the sea ice, this bear has just given birth to twins.
在坡上一處可以俯瞰海冰的洞穴里這頭母熊剛剛生育了一對(duì)雙胞胎。
The cubs are born blind and deaf but instinct drives them to find their mother's milk.
初生的小熊即瞎又聾但本能使它們摸索著喝到母親乳汁。
The milk is one third fat. On this rich diet, the cubs will grow rapidly.
母乳中有三分之一是脂肪，靠著這營(yíng)養(yǎng)豐富的膳食，幼崽們會(huì)迅速成長(zhǎng)。
