a sealed book造句 1) It's a sealed book to me. 2) He is a sealed Book to her. 3) Books were beyond her interest - knowledge a sealed book. 4) Fifteenth - century art was a sealed book to him. 5) The origin of the universe is still a sealed book to us. 6) I know a little Russian, but this is a sealed book to me. 7) The young generation was always something of a sealed book to Mr Smith.