n.说话者；发言者；说某种语言者；扬声器

The speaker was boring everybody. 说话者令每个人生厌。

These gestures are extremely important as they virtually negate what the speaker says. 这些肢体动作极其重要，因为它们几乎否定掉说话者所说的话。

I call on Mr. Oates, the first speaker on my list. 现在请名单上第一位发言者奥茨先生讲话。

The left-hand speaker doesn't seem to be working. 左手的扬声器看样子失灵了。

The speaker volume is not turned up or is muted. 扬声器音量没打开或静音。