Photo taken on Nov. 14, 2018 shows the exterior view of the exhibition hall of the 20th China Hi-Tech Fair (CHTF) in Shenzhen, south China's Guangdong Province. Over 60 delegations from more than 40 countries, regions, and international organizations have participated in the CHTF, which opened in Shenzhen on Wednesday, bringing more than 1,000 new products and technology to the five-day event. (Xinhua/Mao Siqian)