We cannot guess his motives. We just have to deal with the reality: that a North Korea that is proliferating weapons and missiles is a serious threat and danger to the world."

VOA: standard.2009.06.14

It was a threat to hierarchy and the South became quite distinctively a very hierarchical society more on that in just a second.

民主对阶级制度是一大威胁,相对于北方,南方的阶级制度,更根深蒂固

耶鲁公开课 - 美国内战与重建课程节选

I think it is a threat not just to the United States, but to many many countries We've seen the Al-Quada a taxi actually kills far more Muslims than Christians.

我认为它不仅仅对于美国是一个威胁，而是对很多很多国家,我们看到基地组织一个出租车撞死的穆斯林比基督教的人多。

普林斯顿公开课 - 国际座谈会课程节选