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
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