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Farmers make sweet potato vermicelli in Zhangcun Township of Huixian County, central China's Henan Province, Dec. 26, 2017. (Xinhua/Li Jianan)

Farmers make sweet potato vermicelli in Zhangcun Township of Huixian County, central China's Henan Province, Dec. 26, 2017. (Xinhua/Li Jianan)