Students who are unable to attend a class must inform the instructor in advance, either in person or by telephone.

如果因故不能来上课，要事先以电话请假或亲自告知老师。

youdao

Students who are unable to attend a class must inform the instructor in advance, either in person or by telephone.

如果因故不能来上课，要事先以电话请假或亲自告知老师。

youdao