open book
open book — 名詞
1. a person who makes no effort to conceal their inner thoughts or emotions, making
坦率的人
心思容易被看透的人
a person who makes no effort to conceal their inner thoughts or emotions, making it simple for other people to read their state of mind.
Nora is an open book — when she feels upset, her face shows it right away.
Nora 就是個坦率的人——她不開心時，臉上馬上就看得出來。
predicative: [person] is an open book
Jude has always been an open book, happily telling coworkers about his weekend plans.
Jude 向來是個坦率的人，總是樂於跟同事分享週末的計畫。
always been an open book — adverb between copula and noun
Mei tried to hide her disappointment, but she is an open book and everyone guessed.
Mei 本來想隱藏失望的心情，但她這個人太容易看穿，每個人都猜到了。
contrast pattern: tried to hide… but [person] is an open book
The witness was an open book on the stand, answering every question without any delay.
那位證人在證人席上毫無隱瞞，每一個問題都毫不猶豫地回答。
Imani never lies; she is an open book, and her friends value that honesty.
Imani 從不說謊；她是個坦率的人，她最好的朋友們非常珍惜她的誠實。
- an open book
- like an open book (in the related idiom read someone like an open book)
- transparent
less metaphorical; implies motives are visible rather than personality being readable
- guileless
more formal, emphasises lack of deceit rather than ease of reading
- frank
focuses on speech rather than overall demeanour
- closed book
the direct opposite idiom for someone whose thoughts are hard to read
- enigma
more formal; a person who is puzzling and hard to understand
文法句型
[person] is an open book
用法筆記
Frequently used with the verb be (is / was / has always been) in a predicative pattern — the person is described as an open book rather than having one. The phrase rarely appears with an article other than an, and almost never in the plural.
常見錯誤
open book — 慣用語
1. a situation, fact, or thing that is completely known or understood, with nothing
公開透明
毫無隱瞞的事物或情況
a situation, fact, or thing that is completely known or understood, with nothing hidden, secret, or mysterious about it.
After the new policy took effect, the company's spending became an open book to everyone.
新政策實施後，公司的開支對所有人來說都變得公開透明。
became an open book — change-of-state verb with the idiom
Walid's family history is an open book; he shares old photos without any hesitation.
Walid 的家族歷史毫無隱瞞；他毫不猶豫地分享老照片。
subject is abstract possession: [possessor]'s [thing] is an open book
For the experienced detective, the case was an open book from the very first day.
對那位經驗豐富的偵探來說，這起案子從第一天起就一清二楚。
Minh posted the recipe online, so the method is now an open book for anyone.
Minh 把完整食譜公布上網，所以這道菜的作法對任何人都不再是秘密。
Amelia keeps her research notes on a shared drive, making the project an open book.
Amelia 把研究筆記存在共享雲端，讓整個計畫完全公開透明。
making + object + an open book — causative structure
- become an open book
- make something an open book
- is an open book
- an open book to [someone]
- transparent
more general; can apply to systems, processes, or people
- unconcealed
more formal; emphasises that nothing is hidden
- plain to see
informal; similar meaning but adjectival rather than noun-based
- closed book
direct opposite for a thing that is not understood
- mystery
a thing that is not known or understood
文法句型
[thing] is an open book
用法筆記
Distinguish from the noun sense (EASY TO READ): the idiom sense describes a thing, fact, or situation rather than a person. Often used after verbs of disclosure such as become, make, or keep. Common in business and journalistic contexts about transparency.
常見錯誤
同根字
- open-book形容詞C1