I should say all of these dates that I will be giving you are some combination of Greek tradition-- and the Greeks dated these colonies very specifically.

所有我提供的这些时期,有一些参考了古希腊的传统记载,古希腊人对这些殖民地有很明确的记录

耶鲁公开课 - 古希腊历史简介课程节选

So, I said I'd tell you a little bit more about where this Bohr radius came from, and it came from a model of the atom that pre-dated quantum mechanics, and Neils Bohr is who came up with the idea of the Bohr radius, and here is hanging out with Einstein, he had pretty good company that he kept.

我要告诉你们,波尔半径是从哪里来的,它起源于前量子力学时代的，原子模型,尼尔斯，玻尔提出了，波尔半径的概念,这是他和爱因斯坦在一起，他们是好朋友，当我们讨论这个原子模型时你们要记住的是，在1911年。

麻省理工公开课 - 化学原理课程节选