NASCAR races generally use oval shaped tracks of different lengths that require turns to the left.

VOA: special.2009.04.10

We talked about the inevitability of death; we talked about the variability, that people have different lengths of time before they die.

我们讨论过了死亡的不可避免性;,我们讨论过了其可变性，不同的人在他们死之前有所的时间长度不同。

耶鲁公开课 - 死亡课程节选