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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

Those that succeed can stand for only a few moments on its summit.
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Those that succeed can stand for only a few moments on its summit. 而成功的人们也只能在峰顶短暂逗留

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

for milk produced on a diet of bamboo is wretchedly poor.
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for milk produced on a diet of bamboo is wretchedly poor. 因为由竹子转化来的乳汁少得可怜

Its food, bamboo, on which it totally relies
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Its food, bamboo, on which it totally relies 它完全依赖竹子为生

It'll be a year before it has the strength and skill to kill for itself on these difficult slopes.
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It'll be a year before it has the strength and skill to kill for itself on these difficult slopes. 它至少需要一年时间才能有足够的技巧和力量 在这些艰险的峭壁上独自狩猎

On these treacherous slopes
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On these treacherous slopes 在这些变化莫测的悬崖上

but on these sheer cliffs any slip by either animal could be fatal.
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but on these sheer cliffs any slip by either animal could be fatal. 在如此峻峭的崖壁上 哪一方滑倒都有可能直接送命

This is the greatest concentration of peaks over 5 miles high to be found anywhere on Earth.
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This is the greatest concentration of peaks over 5 miles high to be found anywhere on Earth. 这里是地球上5英里以上高峰最集中的地方

It's the biggest mountain glacier on Earth -
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It's the biggest mountain glacier on Earth - 它是地球上最大的山丘冰川