Territory north of the line would be free of slavery.

VOA: special.2009.02.26

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

I just love that line. We used to eat this fish free in Egypt.

我很喜欢这段，我们以前在埃及，不花钱就可以吃鱼。

耶鲁公开课 - 旧约导论课程节选