People walk in snow in Zhangjiakou City, north China's Hebei Province, Feb. 21, 2017. A cold front brought snowfall to many parts of north China. (Xinhua/Chen Xiaodong)
People walk in snow in Zhangjiakou City, north China's Hebei Province, Feb. 21, 2017. A cold front brought snowfall to many parts of north China. (Xinhua/Chen Xiaodong)