Bridge and tunnel workers dredge the sewerage system of the Wubao Tunnel on the railway linking Taiyuan of north China's Shanxi province and Zhongwei of northwest China's Ningxia Hui Autonomous Region, Jan. 20, 2022. Workers maintain the sewerage system of the Taiyuan-Zhongwei railway to ensure the transportation safety as Spring Festival travel rush begins. [Photo by Yang Chenguang/Xinhua]
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