An exhibitor demonstrates a flash memory system developed by Huawei at the China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The four-day China International Big Data Industry Expo 2019 in the provincial capital of Guiyang is being attended by 448 enterprises from 59 countries and regions, according to the organizing committee. Among them are more than 150 foreign companies, including 39 Fortune 500 firms. (Xinhua/Ou Dongqu)