A visitor experiences virtual reality driving during the 2018 China international big data industry expo in Guiyang, Southwest China's Guizhou province, May 26, 2018. [Photo/Xinhua]

Visitors look at an unmanned aerial vehicle of JD.com during the 2018 China international big data industry expo in Guiyang, Southwest China's Guizhou province, May 26, 2018. [Photo/Xinhua]