"Dopamine is considered a neurotransmitter that is crucial for our ability to perceive rewards and to be motivated in our behavior."

VOA: special.2009.09.16

For our purposes, I think that won't be crucial, and so I'll sometimes talk about this set of abilities without actually having a canonical list.

但鉴于课程的目的,这点并不在我们的讨论重点之内,所以我也许偶尔会提及人的这些能力,但并不会把它们详尽地列举出来

耶鲁公开课 - 死亡课程节选

And here's the crucial point for that person lecturing to you on Tuesday to be the very same person as the person lecturing to you today on Thursday.

这里有个重要问题,那个下星期二给你们上课的人,一定要是这个星期四,给你们上课的人。

耶鲁公开课 - 死亡课程节选

A strong commitment to working together will be crucial, says economist Gianluca Benigno of the London School of Economics - crucial for public perception and for jittery markets.

VOA: standard.2009.04.01

For our purposes,the crucial point is to see that what seems to be going on there is our hero is taking the place of somebody else who's about to die.

我们的目的是搞清楚这里的情况,我们的主人公代替别人死亡了。

耶鲁公开课 - 死亡课程节选