Photo taken on Nov. 5, 2020 shows a negative pressure ambulance at the special area for public health and epidemic prevention of the 3rd China International Import Expo (CIIE) in Shanghai, east China. This year's CIIE marks its first time of the establishment of the special area for public health and epidemic prevention at the Medical Equipment and Healthcare Products exhibition area. The special area presents cutting-edge public health technologies, medical products and services. (Xinhua/Liu Ying)