If you must miss a class, you should notify me in advance.
如果你真的无法上课，应该提前通知我。
If you must miss a class, warn me so that you do not lose credit for class participation.
如果你必须错过一堂课，事前提醒我以防你不会因此而在课堂参与的部分失掉分数。
If you must miss class because of a medical or personal emergency, you should notify me beforehand of the fact by phone, email, or in person, and get the information you missed.
若因看病或个人紧急状况，这堂课你该利用电话、电子邮件或请亲自提前通知我，来得到该节你错过的资讯。
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