Life is like a swallow flying to the sky, which means that people should fly to the sky with their wings and go to a higher and wider sky. Life is like a flying swallow, flying to the sky with green wings. Time is painted as hard sweat, it is like running water. I don't know where the road is. Lu knows I'm on the road. These sentences are not taken from books or lecture notes. Anyone who has studied in the single room of Tsinghua University Library knows that they suddenly appear on the wall in front of the study desk. The message wall is located in the single study room of the library, and only one person can study by himself. There are 24 message walls in a room. Recently, Ouyang Shumiao, a freshman, uploaded a set of photos of these messages in his cyberspace. People who once waved in front of the message wall and lingered, flocked to Ouyang's cyberspace to speak, and even many outsiders simply got up early and took a seat in Tsinghua Library, just to see the elegance of the message wall.