她每花一个小时学习一门课程，就放弃了可以用来学习另外一门课程的一个小时。
For every hour she studies one subject, she gives up an hour she could have used studying the other.
这学期我有太多课程，我想放弃其中的一门。
I have too many courses this semester — I have too many courses this semester.
这学期我有太多课程，我想放弃其中的一门。
I have too many courses this semester — I have too many courses this semester.
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