Photo taken on Dec. 22, 2017 shows the construction site of a bridge build for Line 9 of the metro system of southwest China's Chongqing Municipality. The Line 9 of Chongqing metro, which is about 32.3 kilometers long, is expected to be completed in 2020. (Xinhua/Wang Quanchao)
A worker welds parts on a bridge built for Line 9 of the metro system of southwest China's Chongqing Municipality, Dec. 22, 2017. The Line 9 of Chongqing metro, which is about 32.3 kilometers long, is expected to be completed in 2020. (Xinhua/Wang Quanchao)
Photo taken on Dec. 22, 2017 shows the construction site of a bridge built for Line 9 of the metro system of southwest China's Chongqing Municipality. The Line 9 of Chongqing metro, which is about 32.3 kilometers long, is expected to be completed in 2020. (Xinhua/Wang Quanchao)
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