英文關鍵字
alarm
blue
building
cam
camera
cctv
control
electronic
equipment
eye
guard
hardware
lens
look
monitor
observation
outdoor
overhead
pan
privacy
private
property
protect
protection
public
quad
record
render
safe
safety
secrecy
secure
security
see
shot
sky
spy
street
surveillance
system
tech
technology
tools
tower
traffic
urban
video
view
watch
white