Photo taken on April 22, 2018 shows a performance during the opening ceremony of Hanover Fair 2018 in Hanover, Germany. Hanover Fair, the world's leading industrial trade show, opened on Sunday, as German Chancellor Angela Merkel stressed the importance of free trade. More than 5,000 exhibitors from 75 countries and regions are expected to participate in, and 60 percent of the exhibitors are from outside Germany. (Xinhua/Shan Yuqi)