Aerial photo taken on Dec. 12, 2018 shows vegetable greenhouses with modern techonogies in Laoting Town of Laoting County, north China's Hebei Province. Laoting County has relied on vegetable growing to boost village development and increase farmers' incomes, planting more than 33,533 hectares of vegetables and realizing annual output of 3.2 million tonnes. (Xinhua/Yang Shiyao)