superiority [su:ˌpɪəriˈɒrəti]

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n.优越性，优势

when someone or something is better

We believe in the superiority of this method over that one. 我们相信这种方法比那种方法优越。
His air of calm superiority annoyed her intensely. 他不动声色的优越感让她极其烦恼。