oration [ɔ:ˈreɪʃn]

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n.演说，致辞，叙述法

a formal public speech about a serious subject

He delivered an oration on the decline of family values. 他发表了有关家庭价值观的衰退的演说。
He was asked to deliver an oration at the meeting. 他被邀请在会议上发表演说。