填空题 By duality is meant the property of having two levels of structures,such that units of the 1level are composed of elements of the 2level and each of the two levels has its own principles of organization.(北二外2006研)
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【正确答案】 1、正确答案：primary,    2、secondary    
【答案解析】解析：（双重性是指拥有两层结构的这种属性，底层结构是上层结构的组成成分，每层都有自身的组合规则。)