"I do believe we probably should step up the relatively unobtrusive and relatively easy, although sometimes somewhat expensive, means of looking for explosives perhaps many more K-9 bomb teams at these kinds of places and we should continue put a lot of resources in intelligence work."

VOA: standard.2010.03.30

What's an easy first step?

最容易想到的是什么

耶鲁公开课 - 博弈论课程节选