Aerial photo taken on July 28, 2019 shows farm fields in Saibei management district of Zhangjiakou, north China's Hebei Province. More than 3,300 hectares of farm crops, including potatoes, carrots, rapeseeds and livestock fodder, have generated economies of scale in Zhangjiakou's Saibei management district, as local agricultural authorities seek systematic restruscturing and modernized farming. (Xinhua/Yang Shiyao)