He secretly managed to send top secret files to the east for years until his exposure in 1974.

他多年来秘密地将绝密文件送往东方，直到1974年暴露身份。

金山词霸

This document is confidential, and should never be shown to any other person.

这是份绝密文件, 绝对不能给其他任何人看到.

互联网