A bionic underwater robot is seen at the booth of Festo during the 2019 Hanover Fair in Hanover, Germany, on April 1, 2019. With a total of 6,500 exhibitors from 75 countries and regions, the Hanover Fair shows the latest development of technologies for industrial use, including 5G network, artificial intelligence, light-weight manufacturing among others. (Xinhua/Shan Yuqi)