Wild macaques are seen at the "Small Three Gorges" scenic area in Wushan County, southwest China's Chongqing, May 26, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Wang Quanchao)

Aerial photo taken on April 21, 2018 shows the view of Xinye Village of Shaoxing City, east China's Zhejiang Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Wen Xinyang)

An Eld's deer runs at Datian Eld's deer national nature reserve in south China's Hainan Province, April 3, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Yang Guanyu)

Geng Mingming (L), a scientific staff member, takes sample of lake water in Dongting Lake area, central China's Hunan Province, Aug. 25, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Xue Yuge)

River and lake chiefs clear the water at Louyu reservoir in Yuezhuang Township of Yiyuan County, east China's Shandong Province, April 26, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Zhao Dongshan)

Aerial photo taken on Feb. 25, 2019 shows the Wuzhen scenic spot of Tongxiang City, east China's Zhejiang Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Weng Xinyang)

Aerial photo taken on Sept. 8, 2018 shows solidified sand dunes near the source of the Yarlung Zangbo River in Zhongba County of Xigaze, southwest China's Tibet Autonomous Region. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Purbu Zhaxi)

Photo taken on Feb. 19, 2019 shows the cole flower fields in Puwei Township of Panzhihua City, southwest China's Sichuan Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Lai Xiangdong)

Aerial photo shows a drone of Weixian branch of environmental protection agency of Handan City checking the air quality over a company at Weixian County, north China's Hebei Province, Nov. 1, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Wang Xiao)

A child prepares to put trash into a classified garbage bin at Gangkou Village of Anji County, east China's Zhejiang Province, Aug. 16, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Zhang Chen)

Combo photo shows the residential area along Liangshui River, Oct. 27, 2018 (upper, photo taken by Li Xin) and the view of Liangshui River, Feb. 27, 2013. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua)

Tourists take photos of the cole flower fields at Luoping County, southwest China's Yunnan Province, Feb. 19, 2019. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Qin Qing)

Aerial photo taken on Aug. 1, 2018 shows cars running on the newly-built road at Dongkeng Township of Yulin city, northwest China's Shaanxi Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Tao Ming)

Sheep graze on the grassland at a pasture in Qilian County, northwest China's Qinghai Province, June 19, 2017. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Wu Gang)

Black-necked cranes fly over the natural reserve for black-necked crane in Lhunzhub County, southwest China's Tibet Autonomous Region, Jan. 1, 2019. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Zhang Rufeng)

Aerial photo taken on July 10, 2018 shows river chief and other staff members patrolling on a river at Baojian Village of Huzhou City, east China's Zhejiang Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Xu Yu)

Aerial photo taken on Nov. 25, 2018 shows villagers planting trees on iron core scrapyard in Liuzhuangzi Village of Qian'an City, north China's Hebei Province. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Yang Shiyao)

A herd of Milu deer run at a shelter for Milu deer and birds near Dongting Lake, central China's Hunan Province, May 23, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Li Ga)

Staff members check water quality at an ecological pond at Jinting Township of Suzhou City, east China's Jiangsu Province, July 4, 2018. As "clear waters and lush mountains are invaluable assets," China is seeking better coordination between economic and social development and ecological civilization and has delivered visible results. (Xinhua/Li Xiang)