The suspension of classes in universities means that for some reason, the school decides to suspend normal course teaching activities. The reason for the suspension of classes can be the influence of natural disasters (such as typhoon and rainstorm). ), the rampant infectious diseases, or the school itself emergencies. In some foreign countries, schools may also be closed because of teachers' strikes. During the suspension of classes, students will be suspended, and the school will take corresponding measures according to the specific situation, such as postponing classes, adjusting courses or providing online learning to ensure the progress and safety of students' learning.