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advocate; disputant; debater
(present) writer; author
規制強化の論者たちはテレビで議論した。
The advocates for stronger regulations debated on television.
彼は修正主義に異を唱える著名な論者として知られる。
He is known as a prominent debater against revisionism.
反対論者の主張は的確だ。
The opposing debater's argument was precise.