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

Do you think the world financial crisis from last year has affected the movie industry as well?

你觉得去年开始的世界金融危机也影响到电影业了吗？

经济危机和电影市场 - SpeakingMax英语口语达人