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A farmer works at a cucumber greenhouse in Dazhangtun Village, Tangshan City, north China's Hebei Province, Feb. 28, 2019. (Xinhua/Liu Mancang)
A farmer works at a cucumber greenhouse in Dazhangtun Village, Tangshan City, north China's Hebei Province, Feb. 28, 2019. (Xinhua/Liu Mancang)