The positive-negative contrasts containing affirmation and negation embody the differentiation of the things and the intention of the speakers. So the positive-negative contrasts can be used to make differentiation and interpretation. The author approaches the subject from the following three angles： the patterns and properties, the focus, the main emphasis and the intensity. There are two patterns ofXian Li Hou Po（先立后破） and Xian Po Hou Li（先破后立） in the positive-negative contrasts, and the latter is the commonly used one. The proper...
