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Drones are used for farm work at a field in Nanhe County, north China's Hebei Province, May 2, 2018. (Xinhua/Yang Shiyao)
Machines used for farm work in N China's Hebei
Source: Xinhua| 2018-05-03 16:40:12|Editor: ZX
Drones are used for farm work at a field in Nanhe County, north China's Hebei Province, May 2, 2018. (Xinhua/Yang Shiyao)
