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An avalanche. 100,000 tonnes of snow travelling at 80 miles an hour,
一场雪崩。十万吨积雪以130公里的时速席卷而下，
capable of smashing everything in its path.
足以粉碎沿途的一切。
The mountains of North America are hit by thousands of avalanches every year.
北美洲的山脉每年要发生数千起雪崩。
Yet one animal spends the whole winter slumbering within the snow on these avalanche-prone slopes.
然而有一种动物整个冬季都在这些极易发生雪崩的山坡上冬眠。
And when spring comes, they emerge.
待春天来临，它们就出洞了。
All across these mountains,
在这些山脉中，
grizzly bears make their winter dens 10,000 feet up in the deep snow of leeward slopes.
灰熊将巢筑在背风坡厚厚的积雪之下，海拔高达三千米。
And while they were half-asleep in the depths of winter, their young were born.
他们在隆冬半梦半醒之际产下幼崽。
Now these cubs are taking their first steps into the outside world.
现在这些熊宝宝正迈出他们走向外界的第一步。
