rzeczywista przyczyna

Now, more than a century later, their real cause was still a mystery.

And to seek out the real cause of his friend's death.

Life was giving her real cause to consider another line of work.

If it were not true, one might have real cause to be concerned.

God is the real and universal cause of every movement.

So no one can even suspect the real cause of his death.

At the very least, to give him a real cause for fear.

Tell me, what was the real cause of the revolution?

It took four days for the company to identify the real cause.

The world is a work, an effect, and so must have real cause.