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Visitors view model of the sponge city system at the first China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2018. (Xinhua/Wang Jianhua)
Visitors view model of the sponge city system at the first China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2018. (Xinhua/Wang Jianhua)