A farmer airs the sheet jelly made from sweet potato starch at Pingya Village of Fengshan County, Hechi City, south China's Guangxi Zhuang Autonomous Region, Jan. 10, 2018. (Xinhua/Zhou Enge)

A farmer airs the sheet jelly made from sweet potato starch at Pingya Village of Fengshan County, Hechi City, south China's Guangxi Zhuang Autonomous Region, Jan. 10, 2018. (Xinhua/Zhou Enge)