He says Afghan and international officials must tackle both the source and the consequences of the nation's drug problem.

VOA: standard.2010.06.23

That is to say, he is in a certain sense book- and language-determined, and he's obscurely aware that this is his problem even as it's a source of pride for him.

意思就是，某种程度上他的意志是由书籍和语言决定的，他也模模糊糊地明白即便这是他引以为豪的,同时也是他的一个问题。

耶鲁公开课 - 文学理论导论课程节选

Perhaps you could start your resolution by finding the source of the problem.

也许你可以通过寻找问题的起源来找到解决方案。

Who 课堂 - SpeakingMax英语口语达人

And they do that to localize the source of the problem.

他们会不断的减小,寻找空间来定位问题源。

麻省理工公开课 - 计算机科学及编程导论课程节选