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Aerial photo taken on May 2, 2019 shows workers cleaning the glass curtain wall of a skyscraper in Zhengzhou, capital of central China's Henan Province. (Xinhua/Feng Dapeng)
Aerial photo taken on May 2, 2019 shows workers cleaning the glass curtain wall of a skyscraper in Zhengzhou, capital of central China's Henan Province. (Xinhua/Feng Dapeng)