Once Einstein travelled all over America, and gave lectures everywhere.His driver always listened to his lecture.One day, the driver told Einstein that he knew the lecture so well taht he could give it himself.Einstein agreedwith a smile.

　　爱因斯坦曾周游美国，到各地去讲学。他的司机总是听他的讲座。有一天司机告诉爱因斯坦说他通宵了爱因斯坦的讲座，他也能讲。爱因斯坦笑着同意了。