1. There are different rules and methods in academic field and practical social practice. For the school, introducing a "foreign monk" is to absorb excellent theories and methods in other fields that others are good at, and it is an important means to improve their scientific research ability.

2. The rules in the academic field are very simple, and it can be complicated to say complex. A person with limited energy can do well in academic and social practice, as well as intelligence and ability. But in terms of returns, social practice is obviously higher. So many people enter the university system. Although they are capable, they are not acclimatized, but they are counterproductive.

3. For social people with strong practical ability, the school does not completely ignore it, and will supplement teaching from the side by inviting lectures and other forms. There are many such examples, and it is not necessary to recruit others as teachers. In terms of income, schools are not attractive to these people, but reputation is more effective.

4. The teachers in colleges and universities are seriously saturated, so it can be said that it is basically difficult to do anything in school now. Many young teachers in colleges and universities are seriously clustered together, and there are not enough scientific research funds, which is not very secure for their future academic career. So I basically don't want to recruit people, but simply raise the standard and let people retire.