1. Freshmen can't adapt to the change of environment, especially those who are far away from home and go to other provinces to study, so they are easily acclimatized and have some environmental maladjustments.

2. Freshmen don't adapt to the changes in learning. After intense study in senior high school, universities enter autonomous learning, which easily leads to maladjustment in learning.

Freshmen can't adapt to the changes of life. In high school, most students can go home. After entering the university, you will live independently, which will lead to the inadaptability of life.

Remarks: Individual college students have their own special reasons, such as personality defects.