真相、秘密和欺骗 - 保密

someone who watches or listens to everything that is happening without anyone noticing their presence

to have control over a person or thing, often in way that is not obvious

in a way that goes unnoticed or avoids attracting any attention

in a place where other people cannot see or know about

in a secretive way so that the general public is unaware of what is happening

a list with contact information of people whom one secretly communicates with

黑皮书, 秘密联系人名单

used to refer to a situation where two or more people, organizations, etc. are secretly collaborating with each other to do something dishonest or illegal

to secretly or dishonestly intend to achieve wealth, power, etc.

to secretly take pleasure in something or find it amusing, particularly someone else's problems and misfortunes

used to refer to something that happens unexpectedly and without warning or detection

to remain silent instead of expressing one's disapproval or distress

secretly making plans with another individual or group

used to refer to something that is done in a quiet or discreet manner

in a manner that is inclined to conceal a person's actual feelings and intentions

in a manner that is done secretly or subtly, often to achieve a desired result without drawing much attention

a coded message intended to be understood by a particular group while remaining unnoticed or ambiguous to others

狗哨, 隐秘信息