英文關鍵字
alarm
alert
alfa
alpha
ambulance
attention
bright
channel
circle
danger
device
emergency
emit
engine
equipment
fire
flare
flash
flasher
glow
green
illuminate
lamp
light
loop
movement
nonstop
patrol
police
revolution
roll
rotation
screen
security
shiny
signal
siren
spin
surround
turn
twirl
urgency
warning
whirl