The police on duty tried to shoo away the crowd by using a loud-speaker.
在值班的警员试着把人群散去，于是他使用了扬声器。
2
She gave up talking as she saw bette was trying to listen to the speech that was being relayed through a loud-speaker tied to one of the trees.
系在一棵树上的扩音机里传过来人家的演讲，她看见蓓蒂要听就不说话了。
3
Explosion-proof flexible connecting pipes is used in explosion-proof telephone station, explosion-proof terminal, explosion-proof loud-speaker inlet or outlet to conduit and protect the cable.