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

大约4000多年前人驯化了双峰驼。

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.

所以冈包勒德和他双驼峰必须循雪花，所山脉赶去。

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

这种奇怪表演是公双峰驼吸引路过母骆驼一种方式。

Arabian and Bactrian camels played a similar military role within their geographic range.

阿拉伯骆驼和双峰驼在其地理范围内发挥类似军事作用。

Milked mammals include the cow, sheep, goat, horse, reindeer, water buffalo, yak, and Arabian and Bactrian camels.

挤奶哺乳动物包括牛、绵羊、山羊、马、驯鹿、水牛、牦牛、阿拉伯骆驼和双峰驼。

The domestic animals that were ridden were the horse, donkey, yak, reindeer, and Arabian and Bactrian camels.

骑乘家畜有马、驴、牦牛、驯鹿、阿拉伯骆驼和双峰驼。

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主要栖息地之一但骆驼祖籍却在遥远北美洲。

The three domestic camel species (Arabian camel, Bactrian camel, and llama) played a similar role in areas of North Africa and Arabia, Central Asia, and the Andes, respectively.

三种家养骆驼品种（阿拉伯骆驼、双峰驼和美洲驼）分别在北非和阿拉伯、中亚和安第斯山脉地区发挥类似作用。