他的评论与主题完全无关。

His comments were completely unrelated to the main topic.

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His comments were completely unrelated to the main topic.

unrelated 是由前缀 un-(表示“不、非”)和动词 relate(相关、关联)的过去分词 related 组合而成。unrelated 意思是“不相关的、无关联的”。

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