the

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But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth.
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But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth. 可是 5万多只蓑羽鹤每年都会 进行一场地球上最具挑战性的迁徙

they must cross the Himalayas.
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they must cross the Himalayas. 它们必须跨越喜马拉雅山脉

By late morning ferocious winds are roaring past the peaks.
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By late morning ferocious winds are roaring past the peaks. 晌午时分 群山间狂风大作

The Nepalese call it 'a mountain so high no bird can fly above it.'
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The Nepalese call it 'a mountain so high no bird can fly above it.' 尼泊尔人称之为 “一座高得连鸟也飞不上去的山峰”

The highest peak of all,
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The highest peak of all, 世界上最高的山峰

Mount Everest, five and a half miles above sea level and still rising - the roof of our world.
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Mount Everest, five and a half miles above sea level and still rising - the roof of our world. 海拔5.5英里的世界屋脊 ——珠穆朗玛峰仍在不断升高

but the chances of the cub reaching adulthood are slim.
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but the chances of the cub reaching adulthood are slim. 但是熊猫幼崽长到成年的机会极为渺茫

The struggle of a giant panda mother to raise her cub
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The struggle of a giant panda mother to raise her cub 大熊猫努力养育幼崽的情景

is a touching symbol of the precariousness of life in the mountains.
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is a touching symbol of the precariousness of life in the mountains. 真是大山里濒危生命求生的动人一幕

On the highest summits of our planet
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On the highest summits of our planet 在地球上最高的地方