It was a difficult task, but we brought it off.

任务艰巨，但我们圆满完成了

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　　动词bring于介词off搭配，就等于accomplish，意思是“使实现，做成”（to carry to a successful conclusion ），通常在一些相对正式的场合使用。
　　例句：
　　We've brought off a successful advertising campaign.
　　我们打了一场漂亮的宣传仗。