About 4,000 years ago,Bactrian camels were domesticated.

大约4000多年前人们驯化了双峰驼。

But it is the only source of water, so Bactrian camels eat it.

可是这是唯一的水源，所以双峰驼只能吃雪。

So Ganbold and his twin-humped Bactrian camels must chase the snow towards the mountains where it lingers.

所以冈包勒德和他的双驼峰必须循着雪花，向着它们所属的山脉赶去。

This extraordinary performance is a male Bactrian camel's way of attracting the attention of a passing female.

这种奇怪的表演是公双峰驼吸引路过的母骆驼的一种方式。

China is one of the main habitats for Bactrian camels in the world, but the ancestral home of camels is in North America, far away.

中国是世界上双峰驼的主要栖息地之一但骆驼的祖籍却在遥远的北美洲。