When it comes to missing things, what I really miss is actually the atmosphere in the classroom and the sunny smile of my friend before certain things happened. I felt a bit sad because I was nostalgic for some scenes in my previous life. The narrow alley that I had to pass every day to go to school, the grassland with cobblestones at the school entrance, the scorching sun hanging high in the sky in summer, the humming three-dimensional air conditioner in the classroom, the funny appearance of the math teacher riding a motorcycle, the standard female voice before the English listening session in the afternoon, etc., All seemed to be engraved in my mind. I think I can never go back to the past. The buzzing sound of the computer host next to me seems to tell me that time is passing ruthlessly. I can't figure out whether the small scars on my body are mosquito bites or the most tragic memories left by the knives of time.