不同大学、不同学院之间的规章制度各不相同。即使老师欢迎学生来蹭课，旁听者也要注意，不要占用老师的时间。
Regulations vary across departments and universities. Even if a teacher allows students to audit a class, visitors should be careful not to occupy the teacher's time.
不同大学、不同学院之间的规章制度各不相同。即使老师欢迎学生来蹭课，旁听者也要注意，不要占用老师的时间。
Regulations vary across departments and universities. Even if a teacher allows students to audit a class, visitors should be careful not to occupy the teacher's time.
应用推荐