A visitor tries a 4D racing simulator during Guiyang International Big Data Expo 2016 in Guiyang, capital of southwest China's Guizhou Province, May 25, 2016. The 5-day expo exhibits the world's latest development of cutting-edge big data-based technologies, products and solutions. The 2016 China Big Data Industry Summit & China E-Commerce Innovation and Development Summit are also held during the expo. (Photo: Xinhua/Liu Xu)
