A worker checks the quality of vinegar in Chishui, southwest China's Guizhou Province, June 26, 2020. Chishui has been famous for its sun vinegar, which has maintained a traditional making process. The production techniques of the Chishui vinegar, featuring the sunning process, was listed as a provincial intangible cultural heritage of Guizhou in 2009. (Xinhua/Tao Liang)
