Advanced artificial intelligence (AI) technology is the highlight of the ongoing 19th China High-tech Fair (CHTF), which opened in Shenzhen of south China's Guangdong Province on Thursday. An intelligent recognition system has drawn much attention as it can precisely match a person's appearance with his or her ID picture regardless of the difference in terms of their age, hairstyle and appearance.  Another favorite is a robot arm that can emulate the movement of a human arm. The annual China Hi-tech Fair is the largest and most influential national sci-tech fair in China, offering a professional platform to demonstrate the country's technological innovation and industry upgrading.