So, let's look, Act II Scene II. You remember this, Romeo: "but soft, what light through yonder window breaks. It is the east, and Juliet is the sun."

让我们一起看，第二幕第二场，你们记得吧，罗密欧说，但是，温和的，那边窗子里,亮起来的是什么光，那就是东方，朱丽叶就是太阳“

麻省理工公开课 - 固态化学导论课程节选

So you know that x-rays are higher frequency than UV light, for example, that means it's also higher energy than UV light, and if you think back to our photoelectric effect experiments, do you remember what type of light we were usually using for those? Does anyone remember?

你们知道，X，射线的频率比紫外光高，这意味着，它的能量也比紫外光要高，那么，请大家回想一下我们的光电效应实验，大家还记得当时我们用的是什么光源吗？,有人记得吗？

麻省理工公开课 - 化学原理课程节选