1. Supermarket refers to a large-scale comprehensive retail mall which mainly deals in food, household necessities and food by customers' choice. At first, the business was mainly all kinds of food in the supermarket interior, and then the business scope became wider and wider, and gradually expanded to sell clothing, household groceries, household appliances, toys, furniture and medical supplies.

2. Dining halls were called kitchens and dining rooms in ancient times, and now they are also called canteens. They are common in schools, companies, factories and military camps, and are places where a large number of people eat collectively. The main business is catering.