A visitor passes by a demonstration center of Guizhou big data pilot zone during the 2017 China International Big Data Expo in Guiyang, capital of southwest China's Guizhou Province, May 25, 2017. The 2017 China International Big Data Expo is held in Guiyang from May 25 to 28. More than 300 big data enterprises from the world attend the expo. (Xinhua/Ma Yan)
