当蒙古达哈德山谷到了秋季的时候，数百个家庭会赶着羊和驮着东西的牛，穿过高达3000米的山，到冬季可以放牧的地方。
When fall comes to northern Mongolia's Darhad valley, hundreds of families load up their oxen and move their sheep, goats, and cattle over 10,000-foot (3,000-meter) mountains to winter pasture.
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