It's not infrequent that i'll get one or even two people raising their hand that they took Economics 252 from me.

有的时候会有一两个人,举起手说,他们上过我的经济学252号课

耶鲁公开课 - 金融市场课程节选

I like to do that sometimes.

有的时候，我很喜欢玩儿那个。

圣莫妮卡的海滩 - SpeakingMax英语口语达人

Somehow, when I told you to invert the transformation, some of you had some difficulty.

我上次让你们逆推变换公式的时候,有的同学觉得很困难

耶鲁公开课 - 基础物理课程节选

Meaning, sometimes you need to do this, but in general there's at least in my view and I don't, John you just don't want to do this.

意思也就是，有的时候你不得不这么做，但是通常来说,至少我认为不该这么做，你同意这么做么？--，John，，would，you，agree？—,你不该这么做。

麻省理工公开课 - 计算机科学及编程导论课程节选