Doctor Wu Huaiying is on her way to call on patients in Dazhai Village of Liping County in the Miao-Dong Autonomous Prefecture of Qiandongnan, southwest China's Guizhou Province, Aug. 16, 2018. Wu has worked here as a village-based doctor for 27 years. A large number of medical practitioners are active in China's rural areas where health care is still underdeveloped. Under adverse working conditions, they have carried forward the humanitarian spirit and devoted themselves to the health of rural citizens. China will mark its first Medical Workers' Day on Aug. 19, 2018. (Xinhua/Yang Wenbin)