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An exhibitor introduces Ozone water purification technology at the first China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2018. (Xinhua/Wang Jianhua)
An exhibitor introduces Ozone water purification technology at the first China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2018. (Xinhua/Wang Jianhua)