And then for a lot of students too, what this mechanism does is it just takes the edge off a course like this.

对于大多数学生来说，这种机制同时也会削弱,此类课程的作用。

哈佛公开课 - 计算机科学课程节选

And then he just takes that narrow column of light and he admits it to a prism. And what the prism does is takes a tiny, tiny difference in wavelength and refracts it through a different angle.

他只取了那个窄光柱,然后把它对准一个棱镜，棱镜所做的就是,测量出波长的细微差别,然后从不同的角度测定它的折射度。

麻省理工公开课 - 固态化学导论课程节选