Aerial photo taken on June 5, 2020 shows agricultural machinery harvesting wheat in Yongji City, north China's Shanxi Province. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Lyu Xiangqian/Xinhua)

Agricultural machinery harvests wheat at Wenxian County in Jiaozuo City, central China's Henan Province, June, 5, 2020. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Xu Hongxing/Xinhua)

A farmer harvests wheat in the fields in Shaozhuang Township in Qingzhou City, east China's Shandong Province, June 5, 2020. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Wang Jilin/Xinhua)

Aerial photo taken on June 5, 2020 shows agricultural machinery harvesting wheat at Cixian County in Handan City, north China's Hebei province. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Hao Qunying/Xinhua)

Aerial photo taken on June 5, 2020 shows agricultural machinery harvesting wheat in Pingyi County of Linyi City, east China's Shandong Province. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Wu Jiquan/Xinhua)

Aerial photo taken on June 5, 2020 shows agricultural machinery harvesting wheat in Jinhu County, Huai'an City, east China's Jiangsu Province. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by He Jinghua/Xinhua)

Aerial photo taken on June 5, 2020 shows agricultural machinery harvesting wheat at a cooperative in Sanmenxia City, central China's Henan Province. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Du Jie/Xinhua)

Agricultural machinery harvests wheat in Xisu Township, Handan City, north China's Hebei Province, June, 5, 2020. This year's June 6 marks the day of "Mangzhong", the ninth of 24 solar terms on China's Lunar Calendar. (Photo by Hu Gaolei/Xinhua)