"用演说的腔调说" can be translated into English as "speak in a oratorical tone" or "deliver in a speech-like manner".
Here, "oratorical tone" emphasizes the formal, rhythmic, and perhaps somewhat exaggerated style of public speaking, while "speech-like manner" conveys the idea of speaking in a way that resembles a prepared speech. Both expressions capture the essence of delivering words with the deliberate and stylized delivery characteristic of a speech.