We got to the root of the problem.

我们触及了这个问题的根源。

《柯林斯英汉双解大词典》

We have to get to the root of the problem.

我们必须找到问题的根源。

《牛津词典》

We need to get to the root of the problem before we can solve it.

我们需要先弄清问题的根源，然后才能去解决它。

youdao

Kortunov says the Kremlin needs to address the real root of the problem.

VOA: standard.2009.10.15

And by making them go away you don't get to the root of your problem.

虽然恐慌症的症状得以消除,但你却无法找到问题的根源。

耶鲁公开课 - 心理学导论课程节选

"I think a solution to end this piracy, or to reduce it significantly, is possible and it should be done with cooperation of the local community, while at the same time addressing the root causes of the problem,".

VOA: standard.2009.10.30

So, if these batteries are the root of the problem, why not go back to nickel-cadmium?

FORBES: The Formidable Dimensions of Boeing's Dreamliner Problem

And because American arrogance is the root of the problem, the solution must be American contrition.

CENTERFORSECURITYPOLICY: One civilization clashing

Mr McLetchie said the root of the problem is the "weak-kneed approach" to exclusions by the Executive.

BBC: Photo of Scottish flag