[InKunming--Yunnan] Photo taken on Aug. 26, 2018 shows tea products displayed at the China Yunnan Pu'er Tea Expo in Pu'er City, southwest China's Yunnan Province. (Xinhua/Xie Ziyi)

Photo taken on Aug. 26, 2018 shows tea products displayed at the China Yunnan Pu'er Tea Expo in Pu'er City, southwest China's Yunnan Province. (Xinhua/Xie Ziyi)

An exhibitor demonstrates tea art at the China Yunnan Pu'er Tea Expo in Pu'er City, southwest China's Yunnan Province, Aug. 26, 2018. (Xinhua/Xie Ziyi)

Visitors learn about tea products at the China Yunnan Pu'er Tea Expo in Pu'er City, southwest China's Yunnan Province, Aug. 26, 2018. (Xinhua/Xie Ziyi)