[mass noun]the quality or condition of being dual
两重性
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this duality of purpose was discernible in the appointments. 这一目的的两重性可从任命中看出。
【数】 对偶性。
【物理】 二象性;对偶性。
an instance of opposition or contrast between two concepts or two aspects of something; a dualism
对立;对比
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the simple dualities of his youthful Marxism: capitalism against socialism, bourgeois against prole. 他那不成熟的马克思主义的简单对立: 资本主义与社会主义相对立,资产阶级与无产阶级相对立。
"late Middle English: from late Latin