I heard that there is a professional inheritance, and what does it mean?

Smell: smell and know: there are reasons: (ancient and modern synonymous) first: (ancient and modern synonymous) later: skill industry: academic specialization: specialized learning. Understand things first and then understand things, and each has its own research. It can also be said that people can't judge the level of knowledge by age. Only when this person has knowledge that you don't have can he become.

Interpretation: Don't make your own people sad and make your enemies happy. Refers to an action that is only beneficial to the enemy and unfavorable to oneself. Chu: The pastoral book "You Zhou Yu" reads: "If you are not close, you will feel painful, and if you see the enemy, you will be quick."