We firmly believe that our just cause will succeed.

我们坚信我们的正义事业必定胜利。

《新英汉大辞典》

We firmly believe in collective leadership.

我们坚决相信应依靠集体领导。

youdao

We firmly believe that sport can bring the world together.

杰瑞米·基利说：“我们坚信，体育可以把整个世界连在一起。”

youdao

While we firmly believe all these allegations are false, we take them very seriously.

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Now, we firmly believe and strongly advocate that professionals should indeed be superbly talented and adept.

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Yet we firmly believe that a free press is a principle worth fighting for.

BBC: Leveson report: Media reaction