英语词汇“closed book”是什么意思，“closed book”的读音、用法及例句翻译-乐坝网

词汇	closed book
释义	closed bookn.（名词） A person or thing that cannot be known or understood; something unfathomable or puzzling.完全不懂的人，不了解的事：无法认识或了解的人或物；深不可测或迷惑不解的东西
随便看	mutates mutation mutations mutatis mutandis mutchkin mutchkins mute muted muted muter mutes mutest mute swan muth mutilate mutilated mutilates mutilating mutineer mutineered mutineering mutineers muting mutinies mutinous

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