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Huang Bin, director of the Analysis Division of the Environmental Monitoring Center of the Zhangjiajie Municipal Environmental Bureau of Hunan Province, answers questions during a group interview on "securing victory in the hard battle for better environment", held by the press center of the 19th National Congress of the Communist Party of China (CPC) in Beijing, capital of China, Oct. 23, 2017. (Xinhua/Li Xin)