I am a student in the avant-garde campus of Jilin University, and the restaurant in our campus is open to the public. For example, all the staff working in our campus eat in the canteen, and it is no problem for non-school staff to go in and eat. However, when you go to a restaurant to eat, you must first make a ticket, that is, first look at what you want to eat, remember the window number or store name, then pay the cashier to make a ticket (a bit like a supermarket ticket), and then take the ticket to pick up the food.