A picture taken with a fish-eye lens on Aug. 28, 2019 shows a visitor posing for a photo during the 2019 Smart China Expo in southwest China's Chongqing Municipality. New technologies and products are released at the expo themed "Smart Technology: Empowering Economy, Enriching Life". (Xinhua/Wang Quanchao)

A picture taken with a fish-eye lens on Aug. 28, 2019 shows people viewing a brain-controlled car racing during the 2019 Smart China Expo in southwest China's Chongqing Municipality. New technologies and products are released at the expo themed "Smart Technology: Empowering Economy, Enriching Life". (Xinhua/Wang Quanchao)

A picture taken with a fish-eye lens on Aug. 28, 2019 shows people viewing delivery robots during the 2019 Smart China Expo in southwest China's Chongqing Municipality. New technologies and products are released at the expo themed "Smart Technology: Empowering Economy, Enriching Life". (Xinhua/Wang Quanchao)

A picture taken with a fish-eye lens on Aug. 28, 2019 shows people visiting the 2019 Smart China Expo in southwest China's Chongqing Municipality. New technologies and products are released at the expo themed "Smart Technology: Empowering Economy, Enriching Life". (Xinhua/Wang Quanchao)

A picture taken with a fish-eye lens on Aug. 28, 2019 shows staff members demonstrating VR games during the 2019 Smart China Expo in southwest China's Chongqing Municipality. New technologies and products are released at the expo themed "Smart Technology: Empowering Economy, Enriching Life". (Xinhua/Wang Quanchao)