Yes Summer vacation refers to the summer vacation, or the hottest July-August. The school doorman is always on duty at school. First of all, the doorman is on duty by turns, and someone is on duty 24 hours a day. Secondly, the school teachers have a rotation duty system to ensure that someone is on duty for 8 hours. On the one hand, the purpose of duty is to ensure the safety of the school, on the other hand, it is always ready to deal with emergencies or handle the reception of visitors.