Journalists visit the venue of the 2021 Smart China Expo in southwest China's Chongqing Municipality, Aug. 22, 2021. The 2021 Smart China Expo, set to be held from Aug. 23 to 25 in Chongqing, aims to promote exchanges in smart technologies and international cooperation in the smart industry.Photo: Xinhua

Journalists work at the venue of the 2021 Smart China Expo in southwest China's Chongqing Municipality, Aug. 22, 2021. The 2021 Smart China Expo, set to be held from Aug. 23 to 25 in Chongqing, aims to promote exchanges in smart technologies and international cooperation in the smart industry.Photo: Xinhua

A journalist experiences automatic driving at the venue of the 2021 Smart China Expo in southwest China's Chongqing Municipality, Aug. 22, 2021. The 2021 Smart China Expo, set to be held from Aug. 23 to 25 in Chongqing, aims to promote exchanges in smart technologies and international cooperation in the smart industry.Photo: Xinhua

A journalist views the 3D display products at the venue of the 2021 Smart China Expo in southwest China's Chongqing Municipality, Aug. 22, 2021. The 2021 Smart China Expo, set to be held from Aug. 23 to 25 in Chongqing, aims to promote exchanges in smart technologies and international cooperation in the smart industry. Photo: Xinhua

Photo taken on Aug. 22, 2021 shows the venue of the 2021 Smart China Expo in southwest China's Chongqing Municipality. The 2021 Smart China Expo, set to be held from Aug. 23 to 25 in Chongqing, aims to promote exchanges in smart technologies and international cooperation in the smart industry. Photo: Xinhua