przyczyna podstawowa

And that is the root cause of all the problems.

In fact, that might be the root cause of the problem.

That might even be the root cause of its behavior back there.

So to start with, what is the root cause of this economic crisis?

I have no idea what the larger social root cause of this was.

I would actually like to return to the very root cause of this discussion.

The more difficult type of conflict is when values are the root cause.

If you haven't got a root cause of the fight, I want that in there, too.

The root cause of these conditions lies in the home.

It depends what the root cause of the problem is.