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
Workers clean the glass curtain wall of a skyscraper in Zhengzhou, capital of central China's Henan Province, May 2, 2019. (Xinhua/Feng Dapeng)
Workers clean the glass curtain wall of a skyscraper in Zhengzhou, capital of central China's Henan Province, May 2, 2019. (Xinhua/Feng Dapeng)