Ma Lin(L), a guide from Dunhuang Academy China, explains fresco culture to visitors during a Dunhuang fresco itinerant exhibition in Yunnan University in Kunming, southwest China's Yunnan Province, April 10, 2019. A Dunhuang fresco itinerant exhibition, with the participation of nearly 50 frescoes, was held in Yunnan University in Kunming Wednesday. (Xinhua/Qin Qing)