When I was a freshman, I once had a political class. I usually go to class earlier, but I didn't go with my roommate that time. Then I went to the classroom, and there was still about ten minutes of class time. At that time, we were the second largest class in the afternoon. Generally, the teachers in our class arrived earlier. Then there were many students in the class. So I went in through the front door and sat in the front row. I calmly took it out and opened the textbook, and so did the students. Everyone took a look when I went in through the front door. Unexpectedly, after a minute, the teacher said that the class was over and all the students in the classroom except me packed up and left. Only then did I know that this was the teacher's last class, and I couldn't wait to dig a crack and get in. I couldn't be more embarrassed at that time. The point is that I swaggered in through the front door! ! ! The key is that the probability is too small. How can two classes in the same classroom be the same class? Why are these two classes still the same teacher? Why did I go so early? I didn't expect that students who have never come so early usually come so early! ! ! God, I've never been so embarrassed. Or the kind of class in a big class. Oh, my God! ! ! Shame on other classes and even other hospitals.