Yellow River hydrological workers stick to their posts

Staff members of Toudaoguai hydrologic station install a hydrometric propeller at Tuoketuo County, north China's Inner Mongolia Autonomous Region, Jan. 20, 2020. Although the Yellow River has entered its frozen period, hydrological workers here still stuck to their posts. They usually start their work before daybreak in the temperature of minus 20 degrees Celsius. (Xinhua/Bei He)