A woman picks cherry tomatoes at a greenhouse in Dongangezhuang Township of Luanzhou City, north China's Hebei Province, Jan. 20, 2019. In recent years, Luanzhou has been committed to encouraging farmers to grow fruits and vegetables in greenhouses as a way to increase farmers' incomes and boost rural tourism development.

A pair of twins display strawberries they picked at a greenhouse in Luanzhou City, north China's Hebei Province, Jan. 20, 2019. In recent years, Luanzhou has been committed to encouraging farmers to grow fruits and vegetables in greenhouses as a way to increase farmers' incomes and boost rural tourism development.

A woman picks cherry tomatoes at a greenhouse in Dongangezhuang Township of Luanzhou City, north China's Hebei Province, Jan. 20, 2019. In recent years, Luanzhou has been committed to encouraging farmers to grow fruits and vegetables in greenhouses as a way to increase farmers' incomes and boost rural tourism development. (Photo: Xinhua)