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一天,我在写作业,突然冒出来这样一个问题,为什么我写错了字总要用橡皮去擦呢?我用布擦过,用手搓过,都是黑黑的擦不干净。我问妈妈:“为什么橡皮就可以擦掉铅笔字?”可妈妈说她也不知道。没办法我只能想尽办法
One day, when I was writing homework, I suddenly came up with such a question. Why did I always write the wrong word with an eraser? I wiped it with a cloth and rubbed it with my hands. I asked my mom: “Why eraser can erase the pencil? ” Mom said she did not know. No way I can only find ways