Watching -- usually in the context of security or law enforcement, and usually unobtrusively.
it means to observe well in one particular thing
Surveillance cameras are used to monitor target areas, generally businesses and government offices, as well as private residences. They can be either controlled by human interaction or set to...
its watching someone by means of a camera without their knowing
ASAP
Dollars cents drachmas euros and rubles are all monetary units.
Robotic Surveillance Bird
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InFAMOUS - Gameplay - Part 40: Surveillance 3.0