Dream interpretation! I dreamed that I met my first lover who had not been in contact for several years in the elevator.

The elevator is a closed space, symbolizing your thinking space. Many old friends are memories of your past. The elevator is electric, and it runs down, which shows that there is an impulse out of your control that reminds you of the past. The image of running down means that the memory is getting deeper and deeper, and it gradually leads to the depths of the subconscious. Finally, you see the back of other students, but it's her, which means that you have been avoiding her all these years, but she still stays in your memory. Talking means communication.