如果你在接下来的小贴士中遵循我提到的一些关于节省时间的方法，这15个单元仅仅就需要你一点点的课余时间来完成你的任务。
If you follow some of the time-saving tips later in this article, then 15 units should only require a few additional hours outside of class to complete assignments.
我在高中、大学课余时间都一直在做兼职，并利用暑假做全职工作。
I worked part-time during high school, full-time during the summer, and during breaks from college.
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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