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借书： book for reading assignment; check out; volume; check for sb; on the upper shelf; a book hard to identify/ is missing; has been misplaced 师生关系：学生问老师问题;学生寻求老师的帮助;学生询问老师对作业的意见;老师要求学生对论文打印错误等 do research for; semester; work as ones teaching assistant; trouble a professor; may I ask you a few questions; I have a class at ten; come in ones office hours; finish reading ones research report; revise some parts of it; get it published; read some papers he recommended; correct all the typing errors in a paper; read it through again; check the paper for typing errors | 
