First, there are more people in universities than in middle schools and primary schools. Universities, especially comprehensive colleges, are a small society with a very large population, and students from all colleges are concentrated here. And universities are relatively closed. If a person is infected and the virus is brought to the university campus, it is very likely that the whole school will suffer. Therefore, the protection of universities is more difficult than that of middle schools and primary schools. Therefore, after the middle school and primary school can start school, the university will be postponed for some time.

Second, college students come from all corners of the country and can be seen everywhere. Although the epidemic situation in many places has been effectively controlled, and both confirmed patients and suspected patients have been eliminated, there are still some places that are not as optimistic as other places, such as Wuhan. College students come from all over the world, some may come from the hardest hit areas, some may have no confirmed medical records and no suspected cases. Students in the hardest hit areas can easily bring the virus to the university campus. Once there is infection in university campus, it is likely to find the phenomenon of collective infection.

Third, basically, college students have to go through railway stations and airports, which are crowded places, and crowded places are the places with the most hidden dangers. Although the epidemic has been effectively controlled, we still advocate not going to crowded places, but try not to go to crowded places, such as railway stations, airports and other transportation hubs. And the flow of people is very large, you never know who has been here, and you never know whether the person sitting next to you or sitting opposite you is a suspected patient. Due to the particularity of the virus, the incubation period is particularly long, and the symptoms are not obvious. People who are likely to have suspected symptoms in railway stations, airports and college students are likely to be taken to university campuses.

Moreover, students are the flowers of the motherland and the pillars of the future. We should protect students more carefully, so the opening of university campus needs to be extended.