orator [ˈɒrətə(r)]

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n.演说者，演讲者，雄辩家

someone who is good at public speaking

He was so eloquent that he cut down the finest orator. 他能言善辩，胜过最好的演说家。
The orator gestured vigorously while speaking. 这位演讲者讲话时用力地做手势。