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A villager airs sweet potato starch jelly in Zhugou Village, Zaozhuang City, east China's Shandong Province, Nov. 12, 2017. (Xinhua/Liu Mingxiang)

A villager airs sweet potato starch jelly in Zhugou Village, Zaozhuang City, east China's Shandong Province, Nov. 12, 2017. (Xinhua/Liu Mingxiang)