機器
alert
announce
announcement
audio
background
barrier
bell
beware
careful
caution
closeup
cloud
communication
danger
direction
equipment
industry
information
isolated
light
loud
loudspeaker
megaphone
novomoskovsk
old
outdoor
pole
power
public
rail
railroad
railway
safety
sign
signal
sky
sound
speaker
station
steel
stop
thailand
train
vintage
warning