Ronald Noble is Interpol's Secretary General. "We agreed that we would create here in Cameroon, at our regional bureau, the first ever unit dedicated to tracing assets that were taken from a country in a corrupt fashion,"

VOA: standard.2009.11.09

And tracing back where it came from can be really hard.

然后去查找问题来源,可能会很困难。

麻省理工公开课 - 计算机科学及编程导论课程节选