Definition
Describes a situation where the details of something, such as a plan, are kept secret.
密不通風
The specifics of the research remain wrapped in secrecy.
這項研究的具體細節仍然處於保密狀態。
The entire acquisition process was wrapped in secrecy, with no information leaked.
整個收購過程都處於保密狀態，沒有任何信息洩露。
Everything about the project is wrapped up in secrecy until the official release.
有關這個項目的所有內容在正式發布之前都處於保密狀態。