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different opinion; objection
この提案に異論を唱える人はいなかった。
No one raised objections to this proposal.
異論があれば遠慮なく言ってください。
If you have any objections, please don't hesitate to speak up.
会議では様々な異論が出されたが結論に達した。
Various objections were raised at the meeting, but a conclusion was reached.