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. (Photos: 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.

An exhibitor demonstrates straw weaving 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.

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.

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.

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.

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.

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.

A visitor takes photos 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.

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.

Photo taken on Aug. 14, 2020 shows exhibition area of demonstration fields at the 19th China Changchun International Agriculture and Food Fair Expo, in Changchun, northeast China's Jilin Province. The 10-day expo opened here on Friday with a main theme of intelligent agriculture.