/ˌmaɪkrəˈfɒnɪk səˈveɪləns/ – Phrase
Definition: việc theo dõi bằng microphone.
A more thorough explanation: Microphonic surveillance refers to the use of sensitive microphones or other listening devices to monitor and record conversations or sounds in a covert manner. This type of surveillance is often used in law enforcement or intelligence gathering operations to gather evidence or information.
Example: The police obtained a warrant to conduct microphonic surveillance in the suspect’s home to gather evidence of illegal activities.