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A photographer takes photos of advection fog that usually appears in winter in Longyu Village in Bijiang District of Tongren City, southwest China's Guizhou Province, Oct. 29, 2018.(Xinhua/Yang Wenbin)

A photographer takes photos of advection fog that usually appears in winter in Longyu Village in Bijiang District of Tongren City, southwest China's Guizhou Province, Oct. 29, 2018.(Xinhua/Yang Wenbin)