Researcher Zong Li from Lanzhou Institute of Chemical Physics of Chinese Academy of Sciences presents a dry filter made of attapulgite clay in Xuyi County, east China's Jiangsu Province, July 18, 2017. Xuyi, as a featured industry base of attapulgite clay, attracted more than 20 scientific research teams to study and develop the attapulgite clay. (Xinhua/Zhou Haijun)
