英文關鍵字
pole
loud
loudspeaker
audio
speaker
sound
voice
speak
announcement
communication
public
announce
music
warning
megaphone
tree
spruce
volume
old
technology
message
equipment
bullhorn
arena
sky
talk
attention
cloudy
white
system
post
power
wired
advertising
concert
background
play
electric
amplifier
pillar
information
hailers
outdoor
object
signal
megafon
broadcast
alert
vintage
amp