Ford himself put an end to his chances by telling the nation that it was "perfectly safe with Coolidge."

VOA: special.2011.01.27

The point I've got in mind here is this-- even when you think you're perfectly safe, you could of course die of a stroke.

我脑中所想的重点是-,即便是当你认为自己十分安全的时候，你当然也有可能死于中风。

耶鲁公开课 - 死亡课程节选

You--By not randomly assigning people to these two conditions, you may be capturing just individual differences in the kind of person who, when there's a perfectly stable, safe, low bridge, says, "Huh uh. I won't want to go on that bridge.

如果两种情况下的受试者不是随机安排的，或许你所捕捉的,只是一类人中的个体差异，这类人，当看到一个更稳定，更安全，更低的桥，会说，“啊哈，我不走那座桥。

耶鲁公开课 - 心理学导论课程节选