摘要
A young man asked Albert Einstein, the great German scientist, what the secret(秘诀)of success(成功)is.The scientist told him that the secret of success is hard work. A few days later the young man asked him the same question again. Einstein was very unhappy. He did not say anything, but wrote a few words on a piece of paper and handed it to the young man. The young man looked at the piece of paper. On it was written: A = x + y + z.
