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From April to July is the peak hunting season for bears when they eat almost ninety percent of their yearly diet.
四月到六月是北極熊的捕獵高峰期，它們在此期間的捕食量幾乎占全年總量的百分之九十。
They need the ice to hunt their seaborne prey and they must build enough fat preserve to see them through the ice free summer months.
它們需要冰層才能捕食生活在海里的獵物，而且它們必須積累足夠的體內(nèi)脂肪來熬過冰層融化的夏季時光。
Death is swift with a bite to the head.
被一口咬住頭部，獵物很快就死了。
A seal pup full of its mother's milk is a nutritious, energy rich meal.
一頭體內(nèi)充滿母乳的小海豹就是一頓富含營養(yǎng)和能量的美餐。
Hunting seal is never easy, but for a mother bear accompany by noisy cubs, the challenging is even greater.
捕獵海豹向來都不容易，而對帶著吵鬧小熊的母熊來說這就更為艱難了。
The cubs will stay with their mother for over two years learning everything they need to know to survive.
小熊們將與媽媽呆在一起兩年多，學習求生所需要的一切東西。
This cub is eager to get stuck in.
這頭小熊急切地想鉆進去。
The cubs copy the techniques their mother uses to hunt.
小熊們模仿著媽媽捕獵時采用的動作。
But out on the ice, the mother bear is careful to keep her cubs close to her at all times.
不過在冰面上母熊謹慎地時刻使孩子們圍繞在自己身邊。
A large male bear would kill the cubs given the opportunity. For a male, the cubs are simply food.
體型龐大的公熊一旦有時機就會殺死小熊。對公熊來說，小熊只是食物而已。
Male bears are much larger than females and the mother bear must avoid any encounters if her cubs are to survive.
公熊的體型比母熊大得多，因此母熊必須盡力避免與公熊相遇以保證小熊能夠存活下來。
By late April, the high Arctic has daylight around the clock.
到了四月末高緯度的北極地區(qū)已是通宵白晝了。
For the next six months, the sun won't sink below the horizon and its nonstop warmth begins to melt the ice
在未來六個月里，太陽將不會落至地平線以下，它所持續(xù)釋放的熱量開始融化。
The vast island of Greenland is covered with a gigantic ice sheet, in places the ice is more than three kilometers thick, making it the largest body of ice in the northern hemisphere.
冰雪廣闊的格陵蘭島被巨大的冰原覆蓋，某些地方的冰厚度超過了三公里，使它成為了整個北半球最大的冰體。
As the surface of the ice sheet begins to melt, water is on the move everywhere as drips turn to waterfalls and streams flow into roaring rivers,
隨著冰原的表面開始融化，冰融水在到處流動滴水變成了瀑布，溪流變成了咆哮的大河。
Vertical shafts swallow entire rivers as water plunges down to the base of the icecap.
豎井般的冰洞吞沒了整個河流，冰融水沖到冰蓋底部。
The sound of the melt is deafening.
冰塊融化的聲音震耳欲聾。
