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　　young man once asked Albert Einstein (阿尔伯特·爱因斯坦), the great German scientist, what the secret (秘密) of success is. The scientist 1 him that the secret of success 2 hard work. 3 a few days, the young man asked him the same question again. Einstein was very 4 . He did not say 5 , but wrote a few words 6 a piece of paper and handed it to the young man. The young man 7 the piece of paper. On it was written: A＝X＋Y＋Z.

　　“What does this mean?”asked the young man.

　　“A means success,”explained the old scientist.“X means hard work, Y means good methods (方式), and Z means stop 8 and start to work.”

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　　A young man once asked Albert Einstein（阿尔伯特·爱因斯坦）, the great German scientist, what the secret of success is. The scientist t________ him that the secret of success i________ hard work. A________ a few days, the young man asked him the same question again. Einstein was very a________. He didn't say a________, but wrote a few words on a piece of paper, That was A＝X＋Y＋Z.