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