A visitor walks to the model of Jiaolong (flood dragon), the manned deep-sea research submersible during the ongoing 19th China Beijing International High-tech Expo (CHITEC) in Beijing, May 19, 2016. The four-day high-tech expo kicked off on Thursday at the old China International Exhibition Center, with the latest high-tech products on display. This year's expo focuses on how new technologies, products and business formats such as artificial intelligence and "Internet+" can boost industrial restructuring and upgrading. [Photo/Xinhua]