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People visit the smog-shrouded West Lake in Hangzhou, capital of east China's Zhejiang Province, Jan. 18, 2018. (Xinhua/Huang Zongzhi)

People visit the smog-shrouded West Lake in Hangzhou, capital of east China's Zhejiang Province, Jan. 18, 2018. (Xinhua/Huang Zongzhi)