伊索寓言中有一则很有名的故事:《驮盐的驴》。有一头驴驮盐过河,一不小心滑倒在水里。它爬起来后觉得背上的负担轻了,心里很高兴。后来,它驮着布过河,按照先前的经验以为滑倒后再爬起来,背上的负担肯定也会减 Aesop’s Fables There is a famous story: “pack salt donkey.” A donkey carrying salt across the river, accidentally slipped in the water. When it got up, I felt the burden on my back was light and my heart was very happy. Later, it laden with cloth across the river, in accordance with previous experience that the slip and then get up, the burden on the back will certainly be reduced