An egret flies over the Sanya Lake in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)
An egret flies over the Sanya Lake in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)