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A farmer dries sweet potato vermicelli in Machang Village of Shanting District in Zaozhuang, east China's Shandong Province, Jan. 22, 2019. (Xinhua/Li Zongxian)

A farmer dries sweet potato vermicelli in Machang Village of Shanting District in Zaozhuang, east China's Shandong Province, Jan. 22, 2019. (Xinhua/Li Zongxian)