英语词汇“a closed book”的翻译、意思、用法、释义-英汉汉英词典

单词	a closed book
释义	a closed book 完全不懂的学科；尚未揭开的秘密，不为人所知的事，无法理解的事(或人)；高深莫测的事物；谜以上来源于：《21世纪大英汉词典》
随便看	upper side band upper side-band upper sideband upper side-band modulation upper signal upper silesia upper silesia (górny śląsk) upper silurian upper sixth upper slide upper sonar room upper space of silence upper specification limit upper specification limit (usl) upper specification limit {= usl} upper spider upper spring injector upper squama upper stage upper state upper--state upper sternopleural bristle upper stock upper story upper stratosphere