Aerial photo taken on April 7, 2020 shows local farmers working in the field at Liangjiabu Village of Guojiabu Town in Dunhuang City, northwest China's Gansu Province. Taking advantage of the ample sunlight and significant temperature difference between day and night, local farmers have developed fruit cultivation as a way to boost incomes. (Xinhua/Du Zheyu)

A farmer checks the growth of fruits inside a greenhouse at Tuta Village of Guojiabu Town in Dunhuang City, northwest China's Gansu Province, April 7, 2020. Taking advantage of the ample sunlight and significant temperature difference between day and night, local farmers have developed fruit cultivation as a way to boost incomes. (Xinhua/Du Zheyu)

A farmer checks the growth of a watermelon inside a greenhouse at Tuta Village of Guojiabu Town in Dunhuang City, northwest China's Gansu Province, April 7, 2020. Taking advantage of the ample sunlight and significant temperature difference between day and night, local farmers have developed fruit cultivation as a way to boost incomes. (Xinhua/Du Zheyu)

A farmer digs out grape vines to put them on the trellises at Qihaoqiao Village of Guojiabu Town in Dunhuang City, northwest China's Gansu Province, April 7, 2020. Taking advantage of the ample sunlight and significant temperature difference between day and night, local farmers have developed fruit cultivation as a way to boost incomes. (Xinhua/Du Zheyu)

A farmer takes care of fruits inside a greenhouse at Tuta Village of Guojiabu Town in Dunhuang City, northwest China's Gansu Province, April 7, 2020. Taking advantage of the ample sunlight and significant temperature difference between day and night, local farmers have developed fruit cultivation as a way to boost incomes. (Xinhua/Du Zheyu)