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Aerial photo taken on Dec. 2, 2019 shows a train running past the bridge over Xixi River during a trial operation of Chengdu-Guiyang railway in southwest China's Guizhou Province. The 650-kilometer railway is an important part of the country's high-speed rail network consisting of eight main north-south lines and eight main east-west lines, with a design speed of 250 kilometers per hour. (Xinhua/Liu Xu)
