There is a small eraser in my pencil box. Although humble, but it is my study partner! Everyone must know the function of eraser. The so-called eraser is used to erase typos. I remember that I made a mistake in my classroom exercise book in the first grade. At that time, I didn't even know what the eraser was for, so I tried to erase the typo. Then Mr. Hou came over and asked me what was going on. After I told the teacher the reason, the teacher took out a cuboid from my pencil box and told me, "This is an eraser, which can erase all pencils." Teacher Hou said and erased the typo. At the beginning of school, my mother bought me a big rubber. After a long time, the eraser became smaller and smaller. The burly body has become thinner and thinner. Finally one day, the eraser disappeared. I felt sorry for the eraser, and I didn't even praise it when I died. One day, I finally understood the meaning of eraser living in the world, that is, the spirit of sacrificing oneself and serving others silently. I really did it. The spirit of self-sacrifice of rubber is precious and worth learning.