All of that means we need to explain why these folks do what they end up doing, and we have some hints, but of course we do not know with any certainty or any confidence.

综上所述,我们来想想为什么这些人,要背井离乡呢,我们有一些线索,但是我们并没有有力的证据

耶鲁公开课 - 古希腊历史简介课程节选

While it provides insights into booms and their ending, it fails to explain why things must end quite so badly, or how to escape when they do.

ECONOMIST: Heterodox economics

Which may explain why, at week's end, Republicans had decided to say yes to the Democrats for a change.

CNN: There's Something About Linda

But we have to have the courage to go to the end of our strategy and explain that there is no alternative strategy.

WHITEHOUSE: President Obama and President Sarkozy at the White House