Visitors watch demo video about "AI+office" at the fifth World Intelligence Congress at Tianjin Meijiang Conference and Exhibition Center in north China's Tianjin, May 23, 2021. The fifth World Intelligence Congress, a major artificial intelligence (AI) event in China, kicked off in north China's Tianjin Municipality on Thursday, highlighting frontier AI technologies and applications. The four-day event, with the theme of "New Era of Intelligence: Empowering New Development, Fostering New Pattern," has attracted the participation of over 240 AI companies and institutions. [Photo by Li Ran/Xinhua]