On their first day of class in the fall of 2007, we have 41 students in our class this year.

007年秋天，开课第一天，今年一共收录41名学生。

哈佛公开课 - 幸福课课程节选

I announced on the first day of class that I don't, myself, believe in the existence of a soul.

第一节课上,我就声明,本人并不相信灵魂的存在

耶鲁公开课 - 死亡课程节选

The graph is something I showed you on the first day of class, that over the last hundred years in particular, but what's shown on this slide is over the last 300 years.

第一节课我就给你们展示过这幅图,该图特别地关注了近一百年的情况,但它涵盖了过去三百多年的历史

耶鲁公开课 - 生物医学工程探索课程节选