Regression: When students are overwhelmed by emotions that they can't handle, they suddenly return to their original level of development, so that they feel comfortable and will not be disturbed by such emotions.

Projection: it is a psychological phenomenon that a person reflects the values and emotional likes and dislikes in his inner life to people, things and things in the outside world.

Identification: it is to accept the influence of others actively in thought, emotion, attitude and behavior, and make one's attitude and behavior close to others. Identity is essentially an imitation of an example, and its starting point is to try to be consistent with the example.

Transplant: the process of transferring feelings from one person to another.