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On the highest summits of our planet, nothing can live permanently.
在地球上最高的地方，沒有什么生物能在此永久生存
The highest peak of all, Mount Everest.
世界上最高的山峰
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--珠穆朗瑪峰仍在不斷升高
Of those humans who've tried to climb it, 1 in 10 have lost their lives.
在試圖登頂珠峰的人中，有1/10失去了生命
Those that succeed can stand for only a few moments on its summit.
而成功的人們也只能在峰頂短暫逗留
The Nepalese call it, "A mountain so high no bird can fly above it."
尼泊爾人稱之為“一座高得連鳥也飛不上去的山峰”
But each year, over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth.
可是，5萬多只蓑羽鶴每年都會進行一場地球上最具挑戰性的遷徙
To reach their over-wintering grounds in India, they must cross the Himalayas.
要想到達印度境內的越冬場所，它們必須跨越喜馬拉雅山脈
By late morning, ferocious winds are roaring past the peaks.
晌午時分，群山間狂風大作
The cranes must gain height to avoid the building storm.
鶴群必須提升高度，躲避正在形成的風暴
They've hit serious turbulence. They must turn back or risk death.
它們遇上了一股強力氣旋。它們只好掉頭返回，否則就會送命。
