In about 60% of cases, the cause is never discovered.

And will the true cause of the victim's death be discovered?

It wasn't until much later that their scientists discovered the cause.

I would not change places with him if he discovered the cause and cure of cancer.

After extensive research, a possible cause for Peter's condition has been discovered.

An identifiable cause is discovered in only one third of cases.

The longer we keep it up, the greater the chance that Imperial forces will discover the cause.

What you are really trying to do is to discover the cause of the accidents and to prevent them.

The exact cause of the contamination has never been discovered.

The viral cause for this cancer was discovered in 1994.