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
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.' 尼泊尔人称之为 “一座高得连鸟也飞不上去的山峰”
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. 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 大熊猫努力养育幼崽的情景
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 在地球上最高的地方