在上课期间，得到我们的批准后，时间表和频率是可以改变的。

During the class, get our approval, the timetable and frequency can be changed.

youdao

在上课期间，得到我们的批准后，时间表和频率是可以改变的。

During the class, get our approval, the timetable and frequency can be changed.

youdao