But we see if we have a free electron, as we do in this dotted line here, that's going to be a higher energy that's less stable.

但是我们看到如果,我们有一个自由电子，就像虚线所示那样，那将会是一个较高的,不够稳定的能量。

麻省理工公开课 - 化学原理课程节选

That is to say, if you ever saw a dotted line standing upright, it's the Eiffel Tower.

也就是说，如果你看到由点连成的竖线时，那就是埃菲尔铁塔。

耶鲁公开课 - 文学理论导论课程节选