英文關鍵字
advertising
amplifier
animation
announcement
attention
background
bullhorn
command
communications
cut
data
footage
gain
horn
info
information
isolated
loudspeaker
megaphone
message
mouthpiece
news
notification
object
one
people
pipe
resonator
rotates
shout
shouting
single
sound
speaker
speakerphone
trumpet
video
white
word