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A worker checks vinegar fermentation at a traditional vinegar factory in Chishui, southwest China's Guizhou Province, Dec. 23, 2017. (Xinhua/Wang Changyu)
 
 
A worker checks vinegar fermentation at a traditional vinegar factory in Chishui, southwest China's Guizhou Province, Dec. 23, 2017. (Xinhua/Wang Changyu)