It occured to me yesterday in my class that maybe someday there won't be social security numbers anymore, and on birth everybody will be given an e-mail address.

我昨天上课的时候想到,或许有天大家出生时,得到的将不是社会福利号码,而是一个邮箱地址。

麻省理工公开课 - 电影哲学课程节选

n l So negative e, which is sub n l, because it's a function of n and l in terms of quantum numbers.

也就是负的，E，下标是，因为它是一个,关于量子数，n，和，l，的函数。

麻省理工公开课 - 化学原理课程节选