These are some problems with retro viruses.

这就是症结所在了

耶鲁公开课 - 生物医学工程探索课程节选

But there was an increase in discretionary spending And that's the problem, no question about that. -No The republicans sidled up to the troff... and it behaved like porkers Is that roughly what happened? -Yes.

话说回来，当时自由支出确实增长不少,这才是症结所在，这一点毫无疑问，-对吧,共和党一步一步放宽了尺度。,结果导致负债累累,大致原委是这样吧？，-没错。

斯坦福公开课 - 经济学课程节选

I would say that the crux, the kernel of the critique, a lot of things you can argue about-- The kernel of the critique lies in this assertion which derives its force from an interpretation of pictures on pottery.

其症结所在,批判思想的核心,很多事情都可以争论,核心在于一种论断,该论断是从彩釉的画面中,得到启示的

耶鲁公开课 - 古希腊历史简介课程节选