英文關鍵字
automatic
carbon
chain
closeup
connection
control
cylinder
danger
defence
defense
dioxide
dmitrov
emergency
equipment
extinguish
extinguisher
faucet
fire
firefighter
freon
gas
hose
hydrant
indoor
industrial
life
measure
megafon
megaphone
metal
motion
nobody
object
pipe
plug
powerful
pressure
protect
protection
red
rescue
safe
security
solution
system
tilt
valve
wall
water
wide