There is no reason-many years ago, I heard from my seniors that it was going to be built. As a result, people came and went in high school, and there was not even a shadow-in fact, the school cafeteria was not as good as the fast food restaurant outside, and there were many places near overseas Chinese, so there was no need to open it. Maybe there's some reason. If something happens to the canteen, the school might as well not open it in order to reduce the risk, just like a spring outing. Later, after the accident, it stopped organizing tours, and the school was afraid of getting into trouble.