"This is the photo I saw on the first day I returned to school after nearly a year of online learning at home. This photo vividly and colorfully illustrates the 5K Covid prevention rules, making it more eye-catching than other notice boards. This photo is placed at the entrance of the school for everyone to easily see. Along with the photo of the girl, there is a machine for students to scan a QR code (linked to an application, it is PC-COVID), and measure everyone's body temperature before entering the school."