英文: A loudspeaker designed to reproduce bass frequencies.
中文: 低频扬声器设计用来再现低音频率的扬声器英文: We heard the news over the loudspeaker.
中文: 我们听见扩音器里广播了这一消息。英文: Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
中文: 摘要声频定向扬声器是利用参量阵原理,产生高指向性声频信号的新一代扬声器。英文: A device for projecting sound waves, as in a loudspeaker.
中文: 角状扩音器一种用来产生声波的装置,如扬声器英文: The police addressed the crowd through a loudspeaker on their car.
中文: 警察通过他们汽车上的喇叭向人群喊话。