今天，我们有一节几何课。

Today we have a lesson in geometry.

youdao

唐：是啊。我想以前我跟你们两在一起上几何课。

Don: Yeah. I think I was in the same geometry class with you two.

youdao

我已经上了两个小时的几何课，一直等着教授结束这个关于同心圆和凹面图的讲座。

I had been sitting in geometry class for two hours, waiting for the professor to conclude his lecture about concentric circles and concaved figures.

youdao

In class on Monday, we did go over the geometries, and the geometries themselves are very straightforward, once you know what the Lewis structure is, but remember, you can't just always look at a molecule and automatically know the Lewis structure.

在周一的课上，我们讲过了几何形状，一旦你们知道了Lewis结构，这些几何形状是十分直接的，但记住，你不能总是仅仅看一眼,分子就知道它的Lewis结构。

麻省理工公开课 - 化学原理课程节选