closed book怎么读，是什么意思，单词翻译、读音
时间：
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