an open book
US /ən ˈoʊpən bʊk/
UK /ən ˈəʊpən bʊk/
成語
一本打開的書, 坦率的人
a person or thing that is easy to understand or know about
範例:
•
She's always been an open book; you never have to guess what she's thinking.
她一直都是一本打開的書；你從不需要猜測她在想什麼。
•
His past is an open book; there are no secrets.
他的過去是一本打開的書；沒有秘密。