I swear by my personality that I have never been so focused in the past year or so. Slowly, at eleven o'clock, the music of closing the door sounded in the library. It's closed at eleven o'clock in the morning, just kidding. There must be something wrong with the system. Then, I ignored this matter and continued programming. After a while, a middle-aged man's voice suddenly sounded on the radio. I am still programming carefully. After a few minutes, the middle-aged man's voice suddenly floated in my mind, asking my classmates to leave the library as soon as possible. I'm shocked, right? I quickly looked around, and there was a little brother looking at me in the seat about eight meters behind. Everyone else in the library has disappeared. At this moment, the lights in the library suddenly went out. Although it is dark, it is sunny during the day. I quickly stuffed my computer into my bag and walked to the door of the library with my bag on my back. By this time, the little brother was already standing at the door of the library, with a frightened expression on his face, but the door was locked. I was a little desperate. Fortunately, the librarian appeared at this time, and my little brother rushed to the librarian. After the door was opened, the little brother ran away like a ghost. I walked slowly behind and came to the library hall. See the notice posted on the bulletin board,11:00-13: 00 power outage for maintenance. I couldn't help laughing when I remembered my little brother's panicked expression just now.