And I have purposely made the arrow shorter to indicate that it has been slowed because we are going to argue its mass didn't change, so the only way to change its energy is to change its velocity.

我已经故意将这个箭头弄短,用来象征它变慢了,因为我们将证明它的质量没有变，只有它的能量改变了,也就是它的速度变了。

麻省理工公开课 - 固态化学导论课程节选

I write it out in a verse-- MacDonagh and MacBride And Connolly and Pearse Now and in time to be, Wherever green is worn, Are changed, changed utterly: A terrible beauty is born.

我在诗中把它表达出来-,麦克多纳和麦克布莱德,还有康诺利和皮尔斯,现在，或是将来，那所有披上绿色的地方，一切都变了，彻底变了：,一种惊人的美已经诞生。

耶鲁公开课 - 现代诗歌课程节选