I move out of the room toward the bathroom, planning to brush my teeth. As I enter the bathroom, it's much more light, I look in the mirror and-- here's where things get really weird--I don't see anything.

我离开卧室走向浴室,要去刷牙,当我走进浴室时,光线明亮了些,我看着镜子,从这里情节就诡异了,我什么也没看到

耶鲁公开课 - 死亡课程节选

And my bet also is that that sort of distinction, how much teeth you show when you smile, is the sort of thing that would show regional and country by country differences.

我打赌区别还在于，微笑时你露了多少颗牙齿，这可以看出地区和国家的不同。

耶鲁公开课 - 心理学导论课程节选