英语单词“a closed book”的翻译、意思、用法、释义-英汉词典

单词	a closed book
释义	a closed book1.■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
随便看	wet state wet steam wet storage wet strength wet stuff wet suit wettability wettable wet tabling wetted perimeter wetted surface wetted-wall column Wetterhorn wet-test meter wet the baby's head wet the other eye wet the whistle wet through wet thumb wetting agent wetting angle wetting-out agent wetting phase wet to the skin wet trade