Some people ask me if I want you to know the molecular weights and so on, and I thought that was bit excessive.

有些人问我,你们是否需要记住元素的相对分子质量，我认为这样的话要求有点过高了。

麻省理工公开课 - 固态化学导论课程节选

It turns out, it's part of a big picture and all of general relativity is based on this one great equivalence of two quantities which are very different attributes.

已经证明的是,这确实只是冰山一角,广义相对论的所有理论,都是建立在这两个质量相等的基础之上,而这两个质量的属性有很大差异

耶鲁公开课 - 基础物理课程节选