Yen worked on the course last year and she's the senior of the teaching fellows that are working on the course this year.

叶从去年开始就为这门课工作,她是今年这门课程的助教中,较为资深的一名

耶鲁公开课 - 生物医学工程探索课程节选

I don't know how much you've seen, but quite often the way you learned physics earlier on in high school is probably different from the way professional physicists think about it.

我不知道你们对物理有多少了解,但你们以前在高中所学的物理知识,和资深物理学家们的看法,常常是很不一样的

耶鲁公开课 - 基础物理课程节选