Children make pictures with crops during an event held ahead of farmers' harvest festival in Changxing, east China's Zhejiang Province, Sept. 21, 2020. The third Chinese farmers' harvest festival falls on Sept. 22, 2020. (Xinhua/Xu Yu)

Children observe ears of rice under the guidance of their teachers during an event held ahead of farmers' harvest festival in Changxing, east China's Zhejiang Province, Sept. 21, 2020. The third Chinese farmers' harvest festival falls on Sept. 22, 2020. (Xinhua/Xu Yu)

Children take part in a crops transporting competition during an event held ahead of farmers' harvest festival in Changxing, east China's Zhejiang Province, Sept. 21, 2020. The third Chinese farmers' harvest festival falls on Sept. 22, 2020. (Xinhua/Xu Yu)

A teacher teaches children to recognise crops during an event held ahead of farmers' harvest festival in Changxing, east China's Zhejiang Province, Sept. 21, 2020. The third Chinese farmers' harvest festival falls on Sept. 22, 2020. (Xinhua/Xu Yu)