People can't laugh at others and laugh at people who are backward.

As the old saying goes, people are inferior to others, so don't laugh at others. We are just better than some people, not all of them. We shouldn't laugh at others casually. To know the truth that "there are mountains outside the mountains, there are people outside the people", smart people are good at observing and learning from the cleverness of others. "The pole is not as wide as the bench, and the bench is not as long as the pole." Everyone has his own characteristics, and you can't compare your own advantages with others' shortcomings. It is the most unproductive and unreasonable thing to regard one's own strengths as shorter than others; It is what smart people should do to make up for their own shortcomings with the strengths of others.