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Aerial photo shows that two agricultural vehicles working in fields in Lutai Economic Development Zone of Tangshan City, north China's Hebei Province, May 1, 2019. (Xinhua/Liu Mancang)
Aerial photo shows that two agricultural vehicles working in fields in Lutai Economic Development Zone of Tangshan City, north China's Hebei Province, May 1, 2019. (Xinhua/Liu Mancang)