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Visitors are seen at the Traditional Chinese Medicine Industry Expo in Longxi County of Dingxi City, northwest China's Gansu Province, Sept. 26, 2017. (Xinhua/Guo Gang)
Visitors are seen at the Traditional Chinese Medicine Industry Expo in Longxi County of Dingxi City, northwest China's Gansu Province, Sept. 26, 2017. (Xinhua/Guo Gang)