Aerial photo taken on April 28, 2017 shows farmers working in terraced fields planted with potatoes in Weichang County, north China's Hebei Province. (Xinhua/Wang Liqun)
Aerial photo taken on April 28, 2017 shows farmers working in terraced fields planted with potatoes in Weichang County, north China's Hebei Province. (Xinhua/Wang Liqun)