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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

重点解释

Now, the big, wide world holds all sorts of challenges for these brave, young explorers.如今，对于这些勇敢的小小探险家来说广阔的世界充满各种挑战

all sorts of:各种各样的

All sorts of problems assailed us suddenly.

我们突然遇到各种各样的难题。

He associates with all sorts of people.

他与各种各样的人交往。

The mother leads her new family out over the frozen sea to hunt for seals.熊妈妈带领新家庭来到冰冻的海面上捕猎海豹

hunt for:搜寻；寻找

John set out that day to hunt for work.

约翰那天外出找工作。

Davy liked to hunt for bears best of all.

大卫最喜欢猎熊了。

But the spring melt is already under way.但春季的冰雪消融已悄然而至

under way:在进行中

Preparations for a big celebration were under way.

盛大庆祝的准备工作正在进行中。

He gave his consent for the project to get under way.

他同意将这个计划付诸实施。