People visit the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Lin Hong)

People shop at the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Yan Linyun)

An exhibitor arranges Venus flytraps at the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Yan Linyun)

Exhibitors display handicrafts made by farmers via live streaming at the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Yan Linyun)

People look at an agricultural drone at the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Lin Hong)

People visit the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province, Aug. 14, 2020. The 10-day expo opened here on Friday with a main theme of intelligent agriculture. (Xinhua/Lin Hong)