英文關鍵字
apparatus
black
blink
camera
circling
closeup
control
device
electronic
equipment
glass
hemisphere
indoor
isolated
item
lamp
led
lens
monitoring
motion
object
objectglass
objective
observation
one
oversight
plastic
red
reflection
rotates
round
security
shape
signal
single
spherical
spin
superintendence
supervision
surveillance
survey
system
video
watch