So, many of you are new to the Boston area, now I still realize, and I want to let you know it's not required that you be a Red Sox fan to be at MIT.

你们中很多人新来到波士顿地区，现在我仍认识到，我想让你们知道在麻省理工学院,不一定必须做一个红袜队的球迷。

麻省理工公开课 - 化学原理课程节选

you know, people are extra friendly, but it's not necessarily genuine or whatever.

你知道，特别友善，但不一定是真诚的或是怎么样的。

加州的天气 - SpeakingMax英语口语达人

That's a very large number, it's all relative, so you don't necessarily know it's large without me telling you or giving you other ions to compare to, but chlorine does have a very large affinity, meaning it's really likes getting an electron and becoming a chlorine ion.

这是个非常大的数值，这种数值都是相对的，因此你不一定能知道这是非常大的,除非我告诉你或给你另外离子数值作为参考，但是氯确实有很高的电子亲和能，这意味着它非常乐意得到一个电子,而变成一个氯离子。

麻省理工公开课 - 化学原理课程节选

When I don't know even necessarily... Well, it's not my choice,

有时候我甚至自己都不一定知道……嗯，这不是我的选择，

有这样的困难 - SpeakingMax英语口语达人