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$A visitor walks past a sign of China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)$

A visitor walks past a sign of China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)

$Visitors are seen during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)$

Visitors are seen during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)

$A visitor operates an excavator by a remote control system via 5G technology during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)$

A visitor operates an excavator by a remote control system via 5G technology during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)

$A visitor stands in a \$

A visitor stands in a "space tunnel" during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)

$A visitor interacts with a robot with 5G technology during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)$

A visitor interacts with a robot with 5G technology during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Yang Wenbin)

$People visit China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)$

People visit China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)

$A kid views chips designed for 5G base stations by Huawei during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)$

A kid views chips designed for 5G base stations by Huawei during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)

$A visitor plays a football game during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)$

A visitor plays a football game during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)

$An exhibitor interacts with a robot during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)$

An exhibitor interacts with a robot during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)

$A visitor views an intelligent patrol guard during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)$

A visitor views an intelligent patrol guard during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Tao Liang)

$People watch a demonstration of 3D-printing during China International Big Data Industry Expo 2019 in Guiyang, southwest China\'s Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)$

People watch a demonstration of 3D-printing during China International Big Data Industry Expo 2019 in Guiyang, southwest China's Guizhou Province, May 26, 2019. The expo on big data opened Sunday in Guizhou Province, focusing on the latest innovation of the technology and its applications. The four-day expo will be attended by 448 enterprises from 59 countries and regions, according to the organizing committee. (Xinhua/Ou Dongqu)