常見例句Loudspeaker van; loudspeaking (or Boom) car; sound truck 宣傳車sound truck;loudspeaking (or boom) car;Loudspeaker van 宣傳車loudspeaking telephone set 揚聲電話機loudspeaking set 揚聲電話機loudspeaking telephone 揚聲電話機 返回 loudspeaking