an open book
成語所屬單字open
an open book — 慣用語
1. Someone whose thoughts and feelings are easy to understand because they hide not
1.慣用語
釋義
坦率的人
Someone whose thoughts and feelings are easy to understand because they hide nothing.
例句
Mia is an open book; she tells everyone exactly how she feels.
His life is an open book, with no secrets or hidden agendas.