There was no point of any importance left unexplained that I could remember.

The mechanisms by which this effect might occur were left unexplained.

But even then the explanation would he unsatisfactory, as leaving so much unexplained.

Why people would be willing to pay more to go to increasingly less popular movies was left unexplained.

I'd considered leaving a note, explaining that his own bomb did this to him, but I thought it would be better left unexplained.

I'm the only one who's certain there are things left unexplained.

I do not know that anything essential has been left unexplained.

Today there are no secrets, nothing left unseen or unexplained.

I couldn't think of a single thing left unexplained.

And then there was the splash factor, an issue better left unexplained.