Guan Yanping (front) and her colleagues walk on a mountain path in Bingzhongluo Township in Lisu Autonomous Prefecture of Nujiang, southwest China's Yunnan Province, Jan. 13, 2019. Guan, 51, an experienced obstetrician, has volunteered to provide medical service in Bingzhongluo Township since March 2017. To reach the villages that are linked without highways, Guan and her colleagues had to walk to these villages while shouldering medical equipment with baskets. She has trekked over 300 times on the steep, narrow mountain paths to treat people in 46 villages. To help local villagers, she voluntarily extended her service period from the original six months to three years. (Xinhua/Zhang Jiayang)