A few years ago, I was in Zhongxiang Museum, now Yuan You Palace, and a picture of riding a donkey in the late Ming and early Qing Dynasties left a deep impression on me. The characters in the painting are vividly portrayed. Several old people walk along a winding mountain road, but some ride horses, some ride donkeys, some walk and some push carts. Next to the painting, the caption reads: "People ride horses, I ride donkeys, but I don't get on enough, but I get off more." Look back, cart man. "Its implication is profound and thought-provoking. That is to say, others ride horses and ride donkeys themselves. In terms of prestige, it is better to ride donkeys. But riding a donkey is definitely more comfortable than walking. It is difficult to walk, but there will always be times when you are not tired when pushing a cart. It should be good to fall and walk without load. "