Any frequency can't have an energy, you have to -- you don't have a continuum of frequencies that are of a certain energy, it's actually punctuated into these packets that are called photons.

任何频率不能有个能量,你必须要-对某一个能量上,你不会有连续的频率,光子实际上分立的存在。

麻省理工公开课 - 化学原理课程节选

It used to be that you had to big thick course packets that cost a lot of money, but now everything thankfully is available electronically on the course website.

过去你们总是,有厚厚的一打昂贵的资料,好在现在所资料都是电子版的,能在课程网站上得到

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选