Photo taken on Sept. 15, 2020 shows the model of the Mars probe Tianwen-1 at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Photo taken on Sept. 15, 2020 shows the model of submersible Qianlong 3 at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Photo taken on Sept. 15, 2020 shows a satellite model at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Exhibitors introduce exhibits to a visitor at the 22nd China International Industry Fair (CIIF) in east China's Shanghai, Sept. 15, 2020. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Photo taken on Sept. 15, 2020 shows a rocket model at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Photo taken on Sept. 15, 2020 shows the models of sounding rocket at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)

Photo taken on Sept. 15, 2020 shows the model of unmanned submersible "Haidou-1" at the 22nd China International Industry Fair (CIIF) in east China's Shanghai. The 22nd CIIF kicked off at the National Exhibition and Convention Center (Shanghai) on Tuesday. Covering a total display area of 245,000 square meters, this year's CIIF has attracted more than 2,000 exhibitors from 22 countries and regions. (Xinhua/Zhang Jiansong)