loud /laud/ I.adj.大声的，响亮的： He said in a loud voice.他大声地说。 ‖II. adv.大声地：I can not hear you. Please speak a little louder.我听不见你说话，请大声点。

 loudspeaker /ˈlaudspi:kə/ n.［c］ 扬声器，喇叭：The loudspeaker broke down.喇叭坏了。Loudspeakers broadcast the football results.喇叭广播足球赛结果。