英语词汇a closed book是什么意思，a closed book的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典

单词	a closed book
释义	a closed book　谜, 未揭开的秘密高深莫测的事物
随便看	periodontal disease periodontal disease periodontal fibers periodontal granuloma periodontal inflammation periodontal lesion periodontal membrane fibers periodontal membranes periodontal pack periodontal pocket periodontal probe periodontal pyorrhea periodontal reatlachment periodontal recession periodontal therapeutic periodontal varnish periodontia periodontic periodontics periodontics periodontist periodontist periodontitis periodontitis complex periodontium

英汉汉英翻译词典包含1679246条英汉翻译词条，基本涵盖了全部常用英语单词及常用语的翻译及用法，是英语学习及翻译工作的有利工具。