Well, such as Bo Meng, board and other scholars have given Ferguson a different formulation of the definition. All in all, strong foreign representation theory, abstract and even more vague; China will focus practical, but seemed too descriptive.

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Also had such as scholars and so on wave Meng, board standard woods has also given the different indication definition.In brief, overseas indication theoretical, abstract even unspecific; The home stresses practical, but appears the descriptive too to be heavy.

There are activities such as Meng, Henri Bergson, and other scholars have given different interpretations of the definition. All in all, the strong foreign representation theory, more abstract and vague; national focus on utility, but also be descriptive too heavy.