As much as they needed, they got and they chose 250 kids from an at-risk population.

他们的一切要求都得到了满足，他们从受危人群中选了250名孩子。

哈佛公开课 - 幸福课课程节选

We could have gone on and studied the average at-risk population for decades and centuries.

我们本可以继续研究几百年来的,平均受危人群。

哈佛公开课 - 幸福课课程节选

Then that spread to the U.S. and people were very fearful, but the Fed, under Alan Greenspan, was very quick to respond and the whole thing didn't turn out to be anything so bad.

然后又蔓延到美国，人们都谈危色变，但政府在Alan，Greenspan引导下快速反映,事情才没有变的无比糟糕。

耶鲁公开课 - 金融市场课程节选