All right. So, let's pick up where we left off, first of all we're still on the hydrogen atom from Monday.

好，让我们从上次停下的地方讲起，我们还要讲周一讲的氢原子。

麻省理工公开课 - 化学原理课程节选

So now let me pick up where we left off.

现在让我们继续我们代码。

哈佛公开课 - 计算机科学课程节选