You should visit the doctor and ask for a written note explaining why you are unable to attend class and when you should be able to return.
看完医生后，你应该请医生为你写一张便条，说明你为什么不能上课及何时能上课。
You should attend to what the teacher said in class.
你应该注意听老师在班上讲的东西。
This means, however, that you should attend all classes, no matter what. Nothing you could read will replace what goes on in class.
然而这代表著不管怎样你需要参与所有的课程。你读的东西无一可以取代课堂上的内容。
You should attend all the classes, no matter what. Nothing you could read will replace what goes on in class.
无论如何你都应该参与所有的课堂，没有任何你自己念的可以替代课堂所得到的。
You should attend all the classes, no matter what. Nothing you could read will replace what goes on in class.
无论如何你都应该参与所有的课堂，没有任何你自己念的可以替代课堂所得到的。
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