In this aerial photo taken on April 20, 2019, farmers of an agricultural cooperative work in a field in Binzhou, east China's Shandong Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20. (Xinhua/Zhang Chunfeng)