机要

例句：

1. 1.The secretary is responsible for the daily work of the office.
   秘书负责办公室的日常工作。
2. 2.The confidential document was not meant to be shared with anyone else.
   那份机密文件不能与其他人分享。
3. 3. The top secret project has been under wraps for months.
   这个绝密项目已经保密了几个月。