A staff member introduces exhibits to visitors at Luoyang Sancai Art Museum in Luoyang, central China's Henan Province, May 13, 2019. Sancai refers to tri-colored glazed pottery. A total of 69 museums in various kinds are open to the public in Luoyang, which has a long history and was the capital of 13 dynasties in ancient China. (Xinhua/Li An)