On the subject of North Korea, ElBaradei said there are two key issues: "One is its obsession with security and the possibility of regime change by the U.S.

VOA: standard.2009.11.04

And I think that turns out to be a great key to understanding what's happening, and everything you hear from me on this subject I learned from Hanson.

我想这对于你们能否理解,我从汉森那里学到的一些知识,是极为关键的一点

耶鲁公开课 - 古希腊历史简介课程节选