Photo taken on Nov. 28, 2020 shows an antivirus machine displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Zhang Ailin)

A visitor tries VR (Virtual Reality) glasses during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region, Nov. 28, 2020. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Lu Boan)

Photo taken on Nov. 28, 2020 shows a model of Fuxing bullet train displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Lu Boan)

Photo taken on Nov. 28, 2020 shows a transparent television displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Zhang Ailin)

Photo taken on Nov. 28, 2020 shows a model of China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Lu Boan)

Photo taken on Nov. 28, 2020 shows a model of maglev train displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China's Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Lu Boan)