So, let me begin by doing a little bit of background so you know what's going on here.

首先，我要做一下背景介绍,你们就能了解情况了。

麻省理工公开课 - 固态化学导论课程节选

So I'd just like to tell you a little bit more about the students.

我想多介绍一点学生情况。

哈佛公开课 - 幸福课课程节选

N --O So we introduced this notation big O which generally refers to worst case.

的平方。，So，，N，squared。,这里我们介绍一个符号,它泛指最坏的情况。

哈佛公开课 - 计算机科学课程节选