Aerial photo shows the scenery of Fengxiang wetland park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Aerial photo shows the scenery of Wanlyuyuan park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Aerial photo shows the scenery of Fengxiang wetland park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Aerial photo shows the scenery of Wuyuanhe wetland park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Aerial photo shows the scenery of Wanlyuyuan park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　A child plays at Fengxiang wetland park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Egrets fly above Wuyuanhe wetland park in Haikou City, south China's Hainan Province, Oct. 22, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)

　　Aerial photo shows the scenery of Wanlyuyuan park in Haikou City, south China's Hainan Province, Oct. 23, 2018. Areas along the Meishe river used to be garbage dumps. After two years' wetland restoration, the once filthy areas transformed into good places for leisure activities with powerful function of sewage purification. (Xinhua/Yang Guanyu)