speaker
美: [ˈspikər]
英: [ˈspiːkə(r)]
n. 演讲者；扬声器；说话者；发言者
网络 喇叭；主讲人；演讲人
词形：
speakers
You will calm your nerves and be a much more effective speaker if you speak to one person at a time, for a few second each.
如果你每次只对一个人讲话，每次只讲一会，你就会镇定下来，成为一个更加有影响力的发言者。
If you think I'm going to tell you that public speaking is simple and that anyone can become an accomplished speaker overnight, guess again.
如果你认为我将告诉你公共演讲其实很简单而且任何人都能够一夜之间成为一个老练的演讲家，那么你猜错了。
In fact, the process by which I was selected as the keynote speaker remains something of a mystery to me.
实际上，我被选为大会主要发言人的过程，仍然对我来说是个奇迹。
Speaker of the House Nancy Pelosi said the president's comments were beneath the dignity of the office.
美国众议院议长佩洛西表示，总统的评论有失白宫的尊严。