the distance between 81cm and 121cm should be kept. I often see some bosses in fast food restaurants put two tables and chairs next to each other in order to save space, that is, customers eat and lead tables back to back. In fact, although this makes full use of space, it gives people a feeling of annoyance, especially in street shops without air conditioning on a hot day. When you see that customers seem to be crowded with buses, are you still willing to go in and spend money? Even if there are one or two empty seats, I don't think you want to eat with a stranger. Therefore, I suggest that if you decorate a fast food restaurant in a small shop, the distance between your two tables should be kept at 81cm to 121cm, so that even if the two tables are full of people, you will feel a space between them, which will make you feel much cooler psychologically.