You may run into upper-class students, students who are more advanced, you will run into your TA.

你可能会碰上高年级的学生,他们比你的水平要高,当然还有助教

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kind of give them a sense of what it's like to be an older student.

或者是让他们了解高年级学生的学习生活状态是怎样的。

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He was a Junior at Yale College.

他是耶鲁大学的高年级学生

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