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A staff member (L) introduces solar-powered bus stop display panels based on electronic ink and wireless network technologies during the Mobile World Conference Shanghai (MWCS) 2018 in east China's Shanghai, June 27, 2018. The three-day MWCS 2018 kicked off at the Shanghai New International Expo Center on Wednesday, showing trending mobile products, services and technologies. (Xinhua/Fang Zhe)
