People of Ewenki ethnic group shows sleighs pulled by reindeers at the opening ceremony of a winter Nadam fair in Chen Barag Qi of the Hulun Buir, north China's Inner Mongolia Autonomous Region, Dec. 23, 2017. Nadam Fair, meaning "entertainment" or "recreation" in Mongolian, is a mass traditional Mongolian festival mainly filled with sports events. (Xinhua/Liu Lei)