英文關鍵字
abstract
advertising
alert
animated
animation
announce
announcement
audio
background
broadcast
bullhorn
communicate
communication
concept
design
equipment
graphic
green
hailer
icon
illustration
isolated
lightning
looped
loud
loudspeaker
media
megaphone
message
motion
news
object
promotion
propaganda
public
reproducer
scream
shout
sign
sound
speaker
speech
symbol
vector
video
voice
volume
white