closed book怎么读，是什么意思，单词翻译、读音

英语单词:closed book

意思翻译

closed book

noun [ S ] informal uk/ˌkləʊzd ˈbʊk/ us/ˌkloʊzd ˈbʊk/

一无所知的学科，完全不懂的学科

a subject about which you know or understand nothing

I'm afraid physics will always be a closed book to me. 恐怕我对物理永远是一窍不通了。

Synonyms: enigmamysterysecret