Once I asked my father what the secret of success was.He didn't say a word, but wrote a few words on a piece of paper and handed it to me.I looked at the paper. on it was written:A=X+Y+Z.

　　有一次我问我的爸爸成功的秘密是什么。他什么都没说，不过在一张纸上写了一些字人，然后把纸给了我。我看着那张纸，上面写着A=X+Y+Z。