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

Depending on what you call external and internal environment, this path that I'm tracing here, deep within your digestive system, is really directly connected to the outside world through both ends.

基于你们所谓的外环境和内环境,我在这里我所指的消化系统内部通路,它的两端确实与外界环境直接相通

耶鲁公开课 - 生物医学工程探索课程节选