这里没有正式的课程，没有正式的老师——根本就是开玩笑。

There are no regular courses, no regular teachers, and it's totally a joke.

youdao

接下来，每学期你都要从你试听的课程中选择四到五门来正式注册。

Then from those you visit, you will enroll in four or five a semester.

youdao

接下来，每学期你都要从你试听的课程中选择四到五门来正式注册。

Then from those you visit, you will enroll in four or five a semester.

youdao