Most people had lead in their blood, but it was believed that some amount of lead was acceptable.

VOA: standard.2009.12.19

Well, that may seem to be the most natural way to define death, but it's not an acceptable approach.

这似乎是定义死亡的最自然的方式，但并不是可以接受的方法。

耶鲁公开课 - 死亡课程节选