A volunteer serves disposable hand sanitizer during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 3, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)

A sign reminding people to keep social distancing is seen on the ground of the entrance of the National Exhibition and Convention Center (Shanghai) during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 6, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Chen Yehua)

A staff member walks past a notice board with epidemic prevention and control measures on it during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 4, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhang Yuwei)

People have meal at a table divided by transparent boards during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)

Mascot panda "Jinbao" wearing a face mask is seen in the National Exhibition and Convention Center (Shanghai) during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 6, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Chen Yehua)

Mascot panda "Jinbao" wearing a face mask is seen on the south square of the National Exhibition and Convention Center (Shanghai) during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 6, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Chen Yehua)

A staff member holds a notice board with epidemic prevention and control measures on it at an exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 6, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Chen Yehua)

A volunteer shows a leaflet on epidemic prevention rules during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)

Two volunteers walk past a notice board with epidemic prevention and control measures on it during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)

A visitor checks temperature during the third China International Import Expo (CIIE) in Shanghai, east China, Nov. 7, 2020. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)

Photo taken on Nov. 7, 2020 shows a pickup point for epidemic prevention materials in the National Exhibition and Convention Center (Shanghai) during the third China International Import Expo (CIIE) in Shanghai, east China. Stringent COVID-19 epidemic prevention and control measures are observed during the on-going event. (Xinhua/Zhao Dingzhe)