上大学的时候，在主修课考试来临之前，我的总学习时间也不超过1 ~2小时。
In university, I generally studied less than an hour or two before major exams.
物理是他大学的主修课。
英语是我在大学时的主修课程。
我在哈佛大学主修汉语时，高等数学仅仅是一门选修课，所以我根本不懂高等数学。
I know nothing of advanced mathematics, which was offered as an optional course when I majored in Chinese at Harvard University.
我的主修课是文学，没有选修自然科学，高三时，为了考大学才不得不选学了化学。
I chose literature as my major subject, and I took no science until my junior year when, in order to meet the college entrance requirement, I took a chemistry course.
我的主修课是文学，没有选修自然科学，高三时，为了考大学才不得不选学了化学。
I chose literature as my major subject, and I took no science until my junior year when, in order to meet the college entrance requirement, I took a chemistry course.
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