Actors perform matouqin, a bowed stringed instrument with a scroll carved like a horse's head used by the people of Mongolian ethnic group, during a Nadam fair in Hohhot, capital of north China's Inner Mongolia Autonomous Region, Aug. 31, 2017. A three-day Nadam fair was held here. Nadam, meaning "entertainment" or "recreation" in Mongolian, is a mass traditional Mongolian festival in which people celebrate harvests and pray for good luck. (Xinhua/Ding Genhou)