loudspeaker

n. /ˌlaʊdˈspiːkər/ B1

扬声器；扩音器

A piece of equipment that changes electrical signals into loud sound.

仙境例句

In the dream, a loudspeaker cried "Off with her head!" so loudly that the whole town heard.

在梦里，扩音器喊出"砍掉她的头！"，声音大得全镇都听见了。