英文關鍵字
bulgaria
camera
cameras
cctv
center
central
circuit
computer
computerized
control
crime
examine
guard
industry
lcd
maps
monitor
monitoring
monitors
office
operational
operators
pan
panel
panning
people
personnel
record
remote
room
screens
secret
security
service
spy
spying
strategic
subway
supervise
surveillance
system
technological
technology
terminal
traffic
transportation
video