Pupils of Xinghua primary school plough a field in Luanxian County, north China's Hebei Province, June 17, 2018. The school organized a farming experience activity for students Sunday. (Xinhua/Mu Yu)

Pupils of Xinghua primary school learn to sow a field with corn in Luanxian County, north China's Hebei Province, June 17, 2018. The school organized a farming experience activity for students Sunday. (Xinhua/Mu Yu)

Pupils of Xinghua primary school learn farming in wheat fields in Luanxian County, north China's Hebei Province, June 17, 2018. The school organized a farming experience activity for students Sunday. (Xinhua/Mu Yu)

Pupils of Xinghua primary school work in peanut fields in Luanxian County, north China's Hebei Province, June 17, 2018. The school organized a farming experience activity for students Sunday. (Xinhua/Mu Yu)

Pupils of Xinghua primary school pick ears of wheat in Luanxian County, north China's Hebei Province, June 17, 2018. The school organized a farming experience activity for students Sunday. (Xinhua/Mu Yu)