speaker
... speak-backmethod对话法 speaker发言人;广播员;扬声器 speaker-phone扬声器电话 ...
reporter
... report vt.公布,发表;告发,揭发;报导 reporter n.记者,通讯员;报告人,广播员 sport n.运动;(pl.)运动会 ...
newscaster ; newsreader ; newxxster
telecaster
commentator's monitor