A track patroller is seen during a maintenance work on tracks of a railway section in Fuyuan City, northeast China's Heilongjiang Province, Dec. 19, 2019. Fuyuan is in China's northeastern region where the lowest temperature often drops to minus 20 degrees Celsius in winter. Track patroller Huang Fuhe and his colleagues are responsible for maintenance on tracks of a railway section in the city. Either in scorching summer or in the frigid winter, the workers stick to their posts, with over 10 km covered in every eight-hour daily work. (Xinhua/Xie Jianfei)