You can't. According to relevant information, children are not allowed to eat temporary food in primary school canteens. These foods will lead to food safety problems such as bacterial infection and food poisoning, which are potentially harmful to children's health. Primary school students' immune system is not fully developed, so they are sensitive to harmful substances in food and avoid eating temporary food for children. Temporary food refers to food that is about to reach the shelf life of food, but still within the shelf life, and belongs to the scope of safe food. For example, the "temporary food counter" in the supermarket sells temporary food.