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People visit a smart greenhouse at Cuilingxi Village in Shouguang, a major vegetable base in east China's Shandong Province, April 11, 2019. (Xinhua/Li Ziheng)
People visit a smart greenhouse at Cuilingxi Village in Shouguang, a major vegetable base in east China's Shandong Province, April 11, 2019. (Xinhua/Li Ziheng)