纪录片《冰冻星球》 第96期 极地之限（2）（在线收听）

During the months underground,

在地下的数月时间里

all they've known is their mother.

它们只认识自己的母亲

Now, the big, wide world holds all sorts of challenges

如今 对于这些勇敢的小小探险家来说

for these brave, young explorers.

广阔的世界充满各种挑战

The mother leads her new family out over the frozen sea

熊妈妈带领新家庭来到冰冻的海面上

to hunt for seals.

捕猎海豹

But the spring melt is already under way.

但春季的冰雪消融已悄然而至

All across the Arctic, the sun's warming effect is increasing.

在北极 阳光的增温效应不断加速

Sea ice is showing the first signs of weakening.

海冰首度出现了融化的迹象

Inland, the northern rivers are still locked in ice.

在内陆地区 北部的河流仍处于冰封期

The frozen waterfalls are like dams,

冻结的瀑布如同大坝一般

holding back billions of tonnes of fresh water

储备着数十亿吨

that has not moved for almost six months.

冻结已近半年的淡水资源

The vast watershed lies motionless.

如此巨大的水库一直静卧在那里

But as spring advances,

但随着春天的临近

it begins to stir.

它开始骚动起来

The frozen waterfalls start to weaken.

冻结的瀑布逐渐消融

Above them, the pressure is mounting.

上游处的压力与日俱增