{n.} A secret; something not known or understood. * /The man's early life is a closed book./ * /For Mary, science is a closed book./ * /The history of the town is a closed book./
{n.} A secret; something not known or understood. * /The man's early life is a closed book./ * /For Mary, science is a closed book./ * /The history of the town is a closed book./