Ключевые слова: big, blue, blue sky, brother, camera, cctv, control, detection, electronic, equipment, guard, high, industry, lens, look, modern, monitoring, observe, outdoor, police, precaution, privacy, private, property, protect, protection, record, safety, secure, security, sky, sky bachground, spy, street, surveillance, survey, system, technology, television, urban, video, view, wall, watch, watch city,