A reaper works at the wheat field in Wumaying Village of Nanpi County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Mu Yu)

A reaper works at the wheat field in Wumaying Village of Nanpi County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Mu Yu)

Farmers harvest wheat in Wumaying Village of Nanpi County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Mu Yu)

Farmers harvest wheat in Yanli Village of Nanhe County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Zhu Xudong)

Reapers work at the wheat field in Yanli Village of Nanhe County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Zhu Xudong)

Reapers work at the wheat field in Yanli Village of Nanhe County, north China's Hebei Province, June 10, 2019. The wheat has entered harvest season here. (Xinhua/Zhu Xudong)