What does the fable of Lu people entering the city tell people?

There was a man in the state of Lu who walked into the city gate with a long pole. At first he stood up and held it, but he couldn't get into the gate. Come across and hold it, but you can't get into the gate. I can't think of anything. After a while, an old man came here and said, "I am not a very smart person, but I have seen many things." Why not use a saw to cut off the long pole and enter the city gate? " Lu people listened to the old man's method and cut off the long pole. This is a joke, there is no such stupid person in the world, but this joke tells people a truth: you should be flexible in everything you do, and you should not be one-sided and stubborn. From the aspect of the elderly, we can see that we must pretend to know everything. From the aspect of the elderly, we can see that we must pretend to know everything. This story illustrates two points: 1, limiting the three-dimensional European transformation to two dimensions will lead to some things that are not so perfect, if not unsolvable. Sometimes, seemingly unsolvable problems can actually be solved by divide and conquer, that is, turning big problems into small ones. I hope I can help you O(∩_∩)O