And, a lot of the derivations you will see in physics rely on this being able to model as point charges.

然后，你在物理学中看到的许多东西,都是靠以点电荷为模型得到的。

麻省理工公开课 - 固态化学导论课程节选

And that leads to a notion of being able to model the market, how?

这样就引出了建立市场模型的概念,怎样建立呢？

麻省理工公开课 - 计算机科学及编程导论课程节选