- 保密文件 bǎomìwénjiàn classified documentclassified or confidential document; secret file
- 机密文件 jīmìwénjiàn classified documentsecret or confidential document; classified files
- 秘密文件 mìmìwénjiàn secret documentsecret or confidential document; classified file
- 绝密文件 juémìwénjiàn top secret documenttop secret document or classified papers
