A staff member introduces modern agricultural knowledge for children at a modern agricultural garden in Hengshui City, north China's Hebei Province, Aug. 8, 2018. Children learn agricultural knowledge here during their summer vacation. (Xinhua/Zhu Xudong)

Children visit a modern agricultural garden in Hengshui City, north China's Hebei Province, Aug. 8, 2018. Children learn agricultural knowledge here during their summer vacation. (Xinhua/Zhu Xudong)

A staff member introduces cultivating technology for children at a modern agricultural garden in Hengshui City, north China's Hebei Province, Aug. 8, 2018. Children learn agricultural knowledge here during their summer vacation. (Xinhua/Zhu Xudong)

A child visits a modern agricultural garden in Hengshui City, north China's Hebei Province, Aug. 8, 2018. Children learn agricultural knowledge here during their summer vacation. (Xinhua/Zhu Xudong)