Aziz,who currently heads the Regional Institute of Policy, Research and Training in Peshawar, describes the key differences between the Swat Valley and Waziristan.

VOA: standard.2009.06.18

And my bet also is that that sort of distinction, how much teeth you show when you smile, is the sort of thing that would show regional and country by country differences.

我打赌区别还在于，微笑时你露了多少颗牙齿，这可以看出地区和国家的不同。

耶鲁公开课 - 心理学导论课程节选