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At the northern extreme of our planet, the sun rises for the first time in months,
而在地球的北極，太陽(yáng)在數(shù)個(gè)月的沉寂后第一次升起，
illuminating a very different ice world.
陽(yáng)光照亮了一個(gè)截然不同的冰的世界
Unlike Antarctica, the Arctic is a vast frozen sea surrounded by land.
與南極不同，北極是廣闊的冰封海洋，被陸地包圍。
Here winter is coming to an end, but this bleak wilderness remains locked in ice.
這里的冬天已經(jīng)臨近尾聲，但這片荒涼的無人區(qū)仍然是冰封的天地。
Eider ducks break the silence.
絨鴨的到來打破了這里的平靜
They have stayed here, braving the northern winter, instead of flying south to warmer climes.
絨鴨沒有遷徙到溫暖的南方，而一直堅(jiān)守在這里經(jīng)受著北方寒冬的考驗(yàn)。
Flocks 40,000 strong sweep across the frozen wastes.
4萬只絨鴨飛越這一片冰天雪地的荒野
They all have the same goal, a polynya,
它們都有相同的目標(biāo)--冰間湖（冰穴）
a permanent hole in the sea ice, kept open throughout the winter by strong ocean currents.
冰間湖是結(jié)冰的海洋上永久性的洞孔，因?yàn)橛袕?qiáng)大的洋流使它們冬天也不會(huì)冰封。
This unusual duck pond provides an overnight sanctuary and, when day breaks, a rare chance to feed.
這個(gè)不同尋常的水池是過夜的庇護(hù)所，而且到了白天還有難得的進(jìn)食機(jī)會(huì)。
Just 10 metres beneath the ice, the sea floor is carpeted with dense mussel beds.
就在離冰面10米以下的海底上，布滿了密密麻麻的貽貝。
These can only be reached during a brief lull in the currents.
這個(gè)地方只有在洋流暫時(shí)停歇時(shí)才能吃到
The ducks must quickly prise the mussels free before the tide starts to turn.
絨鴨必須趕在潮流轉(zhuǎn)向之前迅速采食
The window of opportunity is short.
機(jī)會(huì)之窗隨時(shí)可能關(guān)閉
As the current begins to build, it's up, up and away.
洋流開始轉(zhuǎn)強(qiáng)時(shí)它們就只好遠(yuǎn)走高飛了。
