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9806 篇文章
Every year three million caribou migrate across the Arctic tundra.
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Every year three million caribou migrate across the Arctic tundra. 每年 300万迁徙的北美驯鹿 都将穿越北极苔原

Nearly half of all cubs die in their first year out on the ice.
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Nearly half of all cubs die in their first year out on the ice. 大约有近一半的幼熊 会在第一年的冰上历险中丧生

and the thawing shifting landscape.
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and the thawing shifting landscape. 融化的冰雪不断改变着地貌

Further south the winter snows have almost cleared from the Arctic tundra.
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Further south the winter snows have almost cleared from the Arctic tundra. 在更远的北极苔原上 冬雪几乎已经完全消失

for a few miles from the coast the ice is already splitting.
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for a few miles from the coast the ice is already splitting. 离岸几英里远的海面上 冰层已经开始崩裂

Now the mother can start hunting for the seals they must have,
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Now the mother can start hunting for the seals they must have, 现在母熊将猎杀海豹 获取紧需的食物

and the mother has led her cubs a mile from the den.
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and the mother has led her cubs a mile from the den. 母熊已经带领幼熊离巢1英里远

It's time to put them to the test.
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It's time to put them to the test. 现在该是考验它们的时候了

The sea ice still holds firm,
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The sea ice still holds firm, 海面上的冰层依然坚固

It's six days since the bears emerged
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It's six days since the bears emerged 现在是北极熊现身后的第6天