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.
巡逻队的头儿，摇了摇头说，“在这之前我听信了你的托词，但是现在我们在这里发现了太多补习学校的证据，”他说，“在这个社区，这个补习学校是一个公开的秘密，你们已经违法经营多时了。”
"I've allowed your excuses before, but we're getting too many tips about this place, " he says. "It's an open secret in this community that you've been operating illegally."
我参加了补习训练以提高自己的驾驶技术。
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