英文關鍵字
flasher
light
illuminate
alarm
alert
attention
black
blue
bright
circle
danger
device
dim
electrician
emergency
emit
equipment
flash
glass
glow
lamp
movement
nonstop
patrol
plastic
police
rapidly
revolution
roll
rotation
security
shiny
sign
signal
siren
special
spin
surround
symbol
technology
turn
turning
twirl
urgency
volution
wall
warning
whirlabout
loop