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Technicians check the Tiansheng Bridge of the Shanghai-Kunming Railway in the Wumeng Mountain, southwest China's Guizhou Province, Feb. 12, 2019. (Xinhua/Tao Liang)
 
 
Technicians check the Tiansheng Bridge of the Shanghai-Kunming Railway in the Wumeng Mountain, southwest China's Guizhou Province, Feb. 12, 2019. (Xinhua/Tao Liang)