Vertically means that every class connected to the next class is connected to every class throughout the semester around a spiral.

纵向意味着每一节课都和下一节课有关系,和整个学期内的每一节课都有关系，呈一个螺旋状。

哈佛公开课 - 幸福课课程节选

But one could easily spend an entire semester thinking about that question alone.

但是也会有人容易的花一整个学期,一个人自己思考问题。

耶鲁公开课 - 死亡课程节选

Tal This is not only extraordinary that he is sharing his time with us, but he's actually moved here back, moved his family back from Israel for the entire semester,-- his wife and his two little children just so he can teach this class with us.

太谦虚了，Tal，is，too，humble。,很荣幸他能给我们上课，他还把家搬来了，把家从以色列搬到这一整个学期-,包括他的妻子和他的两个孩子，只是为了能和我们一起教这门课。

哈佛公开课 - 幸福课课程节选

And we could easily devote an entire semester to discussing it.

要讨论它们的话肯定会花掉一整个学期

耶鲁公开课 - 死亡课程节选