求翻译：professors may establish social relationships with stupents classors,but in the classroom they play the role of an 1 may have coffee with stdents one day but the next day he meet a deadline for a paper or to be prepared for a discussion professor may give extre attention,outside of class,to studey counselors and friends as well as teachers. students must real teacher's role chenges ,they should change their behaviorand是什么意思？

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