Aerial photo shows the scenery of Ziwuling National Nature Reserve in Yan'an, northwest China's Shaanxi Province on Aug. 23, 2018. Yan'an, a former revolutionary base of the Communist Party of China (CPC), is no longer labeled "poor," as its last two impoverished counties have shaken off poverty, the Shaanxi provincial government announced Tuesday. (Xinhua/Shao Rui)