Key symptoms include: disruptive behaviour, decline in performance at school, withdrawal from relationships, argumentative and bickering nature and lack of social skills.

主要症状包括：破坏性的行为，在学校的表现下降，从关系撤出，议论和争吵性质和社交能力不足。

youdao

There is usually a set time within which you can withdraw from the class, and if you withdraw after that time, it will influence your grade. This period for withdrawal is different at every school.

退课也有一定的时间限制，超过一定时间对你的成绩还是会有影响，各个学校对那个时间限制的要求有所不同。

youdao

There is usually a set time within which you can withdraw from the class, and if you withdraw after that time, it will influence your grade. This period for withdrawal is different at every school.

退课也有一定的时间限制，超过一定时间对你的成绩还是会有影响，各个学校对那个时间限制的要求有所不同。

youdao