在大学时，我利用课余时间为数学较差的学生补习。
When I was in college, I spent some of my spare time working as a math tutor for people in the lower-level mathematics classes.
在大学时，我利用课余时间为数学较差的学生补习。
When I was in college, I spent some of my spare time working as a math tutor for people in the lower-level mathematics classes.
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