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Ancient city wall
Aerial photo taken on Jan. 7, 2018 shows the snow-covered ancient city wall built in Ming Dynasty in Xi'an, capital of northwest China's Shaanxi Province. (Xinhua/Liu Xiao)
Ancient city wall
Aerial photo taken on Jan. 7, 2018 shows the snow-covered ancient city wall built in Ming Dynasty in Xi'an, capital of northwest China's Shaanxi Province. (Xinhua/Liu Xiao)