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In this aerial photo taken on April 19, 2019, the Shanghai Tower, a 632-meter skyscraper, is surrounded by thick fog in east China's Shanghai. (Xinhua/Shen Chunchen)
In this aerial photo taken on April 19, 2019, the Shanghai Tower, a 632-meter skyscraper, is surrounded by thick fog in east China's Shanghai. (Xinhua/Shen Chunchen)