英语词汇closed book怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	closed book
释义	closed book [口语] 无法理解的天书，不可捉摸之物，深𪪞难懂(或高深莫测)的东西，难理解的事物，完全不懂的学科已解决的问题，已了解的事，无须再考虑的问题
随便看	average information content average life average limit of ice averagely average man average molecular weight averageness averagenesses average noise factor average ... out average out average out at average outgoing quality limit average out to average path length average power output average price averager averagers averages average sample number average speed average strength average tare average taring

英汉双解词典包含483723条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。