Ranger Feng Dejun (L) and Zhang Detuan check a tree's condition during thier patrol in the Qilian Mountains in Jinchang County, northwest China's Gansu Province, Jan. 15, 2020. Located deep in the Qilian Mountains in Jinchang County, there is a natural resource protection station with nine rangers, who patrol over 20 times every month with the longest round-trip distance up to 50 kilometers. And in the winter, a critical period for forest fire prevention, they often have to patrol on foot as it is too dangerous to ride motorcycles on some parts of snow-covered mountain roads. (Xinhua/Ma Ning)