Suspension of classes. According to the inquiry, the orange rainstorm warning issued by Shenzhen City, Guangdong Province from May 2023 to September 2303 shows that units in dangerous areas should suspend classes and business, and take special measures to protect the safety of students, children and other staff who have arrived at school. The orange warning signal of rainstorm is that the rainfall will reach more than 50 mm within 3 hours, or it has reached more than 50 mm and the rainfall may continue.