求翻译：professors may establish social relationships with stup classors,but in the classroom they play the role of an inst 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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