They're the most dangerous mountains of all. 它们是最危险的山峰
but they're dwarfed by those in the great ranges that divide the Indian subcontinent from Tibet. 但它仍比不上分隔印度次大陆 和西藏的巨大山脉中的冰川
They're the most powerful erosive force on our planet. 它是地球上最大的侵蚀作用
and they're now roosting among the rocks. 栖身于岩石缝隙之中
They're searching for a rather unusual food - 它们正在寻找一种很特别的食物
they're the only monkeys in the world that live almost entirely on grass. 它们是世界上唯一完全以草为生的猴子
and they know that they're close to water. 它们很清楚水就在不远的前方
After weeks of marching they're desperately tired. 经过数周的长途跋涉 它们都已是精疲力尽
They're all heading for the swamps of the Okavango, 它们的目的地是奥卡万戈大沼泽
and they're growing bigger every year. 而且面积每年都在增大