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The sea ice still holds firm, but it won't last much longer.
海面上的冰層依然堅固，但是這種情況不會持續(xù)太久
Day 10, and the mother has led her cubs a mile from the den.
第10天，母熊已經(jīng)帶領(lǐng)幼熊離巢1英里遠
It's time to put them to the test.
現(xiàn)在該是考驗它們的時候了
They've grown enormously in confidence, but they don't have their mother's sense of urgency.
它們的信心日益膨脹，不過它們并不像母熊那樣著急
At last it seems that they're ready for their journey and they're only just in time,
最后，它們似乎做好了旅行的準備，它們剛好趕得及
for a few miles from the coast the ice is already splitting.
離岸幾英里遠的海面上，冰層已經(jīng)開始崩裂
Now the mother can start hunting for the seals they must have,
現(xiàn)在母熊將獵殺海豹，獲取緊需的食物
but she's leading her cubs into a dangerous new world.
而它也正帶著熊崽們進入一個危險的新世界
Nearly half of all cubs die in their first year out on the ice.
大約有近一半的幼熊會在第一年的冰上歷險中喪生
Summer brings 24 hours of sunlight and the thawing shifting landscape.
夏季意味著全天24小時的日照，融化的冰雪不斷改變著地貌
Further south the winter snows have almost cleared from the Arctic tundra.
在更遠的北極苔原上，冬雪幾乎已經(jīng)完全消失
