Farmers work in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)

Farmers work in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)

A farmer works in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)

Farmers work in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)

Farmers work in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)

A farmer works in the rice fields in Hai'an City, east China's Jiangsu Province, June 10, 2018. Farmers are busy with farm work on the occasion of planting season. (Xinhua/Xu Jinbai)