How To Use Closed book In A Sentence

I know hardly anything about climate models: anything involving fluid mechanics is pretty much a closed book to me. Climate Bet Details, Bryan Caplan | EconLog | Library of Economics and Liberty
Nuclear physics is a closed book to most of us.
I can not believe that it can be right that this late in the game Poetry is still a closed book.
That part of her life was a closed book and to open it would cause her terrible distress. Times, Sunday Times
Chemistry is a closed book to me.

Economics was a closed book to him.
I tell myself it's a closed book, but my cover story becomes an old man's compensation.
Mathematics has always been a closed book to me.
It was a matter of masculine pride that he should walk with them, and he had done so in fair seeming; but women had remained to him a closed book, and he preferred a game of solo or seven-up any time. Chapter XII
He is holding a closed book, signifying a mystery, possibly a stage in the alchemical process.
What happens on the remoter flyspecks in the American archipelago remains largely a closed book.
He is holding a closed book, signifying a mystery, possibly a stage in the alchemical process.
Economics was a closed book to him.
Frank Spriggs was a very able man but something of a closed book.
I'm afraid physics will always be a closed book to me.
Nuclear physics is a closed book to most of us.
But the whole sweep of history is to her as a closed book.
That part of her life was a closed book and to open it would cause her terrible distress. Times, Sunday Times
Nuclear physics is a closed book to most of us.