an open book
成語所屬單字book
an open book — 慣用語
1. This describes someone or their life that is easy to understand and know everyth
1.慣用語
釋義
一目了然的人或事
This describes someone or their life that is easy to understand and know everything about.
例句
My grandmother's life is an open book to the family.
Is he really an open book, or does he hide things?