A salesman sorts out dairy products at a livestock products fair in Nagqu of southwest China's Tibet Autonomous Region, Nov. 24, 2017. Local authority organized the three-day winter fair by the side of Qinghai-Tibet highway, to increase income for the herdsmen. (Xinhua/Liu Dongjun)

Aerial photo taken on Nov. 25, 2017 shows a livestock products fair in Nagqu of southwest China's Tibet Autonomous Region. Local authority organized the three-day winter fair by the side of Qinghai-Tibet highway, to increase income for the herdsmen. (Xinhua/Liu Dongjun)

Salesmen sell goods at a livestock products fair in Nagqu of southwest China's Tibet Autonomous Region, Nov. 24, 2017. Local authority organized the three-day winter fair by the side of Qinghai-Tibet highway, to increase income for the herdsmen. (Xinhua/Liu Dongjun)

Combo photos taken on Nov. 25, 2017 shows livestock products at a fair in Nagqu of southwest China's Tibet Autonomous Region. Local authority organized the three-day winter fair by the side of Qinghai-Tibet highway, to increase income for the herdsmen. (Xinhua/Liu Dongjun)