Once upon a time, a pencil and an eraser were having a conversation about their jobs. Both of them were praising each other for their hard work. Both of them knew that they were nothing without each other.
Soon, the pencil started to draw a straight line and the eraser was looking at it. Suddenly, the pencil lost its balance（平衡）and the line was destroyed．Then the pencil got very sad．It said sorry to the eraser. The eraser felt surprised and asked, "For what, my dear friend?"
"I'm sorry that you get hurt because of me. Whenever I make a mistake, you're always there to erase it. But you lose a part of yourself and get smaller each time," cried the pencil.
On hearing this, the eraser said, "That is true but I really don't mind. You see, I was made to help you. So stop worrying, please! I am happy with my job，even though I know I will be gone one day. I will not be happy if I see your sadness."
Our parents are just like the eraser, and we're like the pencil. They're always there for us, cleaning up our mistakes. Sometimes they get hurt when they raise us and with time they become older. But they're always happy with what they do and will always prevent us from being worried or sad．
