Finally, I found one thing common in all their issues. A single common root, for all the problems which was not there till marriage.

最后我发现他们的问题有一个共同点，即根源相同，因为他们的问题都是在结婚后出现的。

youdao

A rhizome is found underground - but it's actually a stem, not a root!

这种根茎长于地下——但它实际上是一种茎，不是根！

youdao

Do you take pride in your work or do you not care how it turns out? If you are more interested in simply completing a project than in doing it well, you may have just found the root of your problem.

你是否对自己的工作感到骄傲？或者你并不在乎它的结果如何？如果你更倾向于仅仅完成任务，而不是出色地完成它，那么这就是你问题的根源了。

youdao

Even if energy scarcity were the root of California's problem, opening Alaska to new production would not solve it: oil found there will take a decade to get to market.

ECONOMIST: Alaska or bust