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
耶鲁公开课 - 基础物理课程节选
And class size is pretty small if you go up to, you know, advanced level classes.
班级挺小的,如果,你知道,你去上高级课程的话。
要考入大学 - SpeakingMax英语口语达人
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