First of all,notice the obvious point that sometimes people die in their sleep,unexpectedly.

首先，有时人是在睡梦中无预兆地死去。

耶鲁公开课 - 死亡课程节选

Of course you believe that at times you're in dreamless sleep.

你当然是相信有时你能进入无梦睡眠的。

耶鲁公开课 - 死亡课程节选

There are some examples that can bring out the moral intuition that our labor can take something that is unowned and make it ours, though sometimes, there are disputes about this.

有些例子可以说明，在道德上,通过劳动能使无主物品成为我们的所有物，尽管有时，这一点颇具争议。

耶鲁公开课 - 公正课程节选