英文關鍵字
alarm
ambulance
beacon
closeup
computer
control
controller
danger
detector
device
display
electric
electrical
electronic
emergency
engineer
engineering
equipment
factory
flashing
flow
gas
green
industrial
industry
lamp
led
light
line
machine
manufacturing
metal
orange
panel
plant
power
red
revolving
roof
safety
screen
security
signal
siren
system
technology
toxic
warning
water
work