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

But for me personally, it doesn't have to be first class.

但是对我个人而言，不一定需要最上乘的。

喜欢巧克力吗？ - SpeakingMax英语口语达人

Levels of happiness are essentially static; and anxiety levels and depression levels, as we talked about in the first class have gone up significantly.

幸福水平几乎是静止的;,焦虑水平和抑郁水平，正如第一堂课讲到的，有明显的加深。

哈佛公开课 - 幸福课课程节选

I alluded to this a little bit in the first class about how humans have evolved to seek out energy because famine was the largest threat is one example of this.

第一节课的时候我提到了,人类是如何演化以便寻找能量,因为饥荒是最大的威胁,这是其中一例

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选