Yeats is talking about an event that has brought forth destruction, destruction of the world before the Easter Uprising.

叶芝描绘了这样一个事件,它带来了毁灭，对复活节前世界的毁灭。

耶鲁公开课 - 现代诗歌课程节选

And in that emphasis on the dark side of schooling, should give pause to adults who were looking for an understanding of why something like Columbine comes about.

这一对学校黑暗面的控诉，应该给成年人们敲了一记警钟,尤其是那些在探讨,为什么会有科罗拉多可伦拜枪杀案这样的事件。

麻省理工公开课 - 媒体、教育、市场课程节选

Notice if I'm going to have two different sub problems I need to have two base cases here to catch this. And if I only had one it would error out. And as a consequence, I can go off and ask about rabbits. Let's see.

我需要定义两个基础事件来处理它,如果我只有一个基础事件的话就会产生错误,这样我就能够知道到底有多少只兔子了,让我们来看看，在第12个月末,没那么简单，在第二年末兔子就很多了。

麻省理工公开课 - 计算机科学及编程导论课程节选