引入了核度与核的概念，以便对系统内各要素对系统的贡献进行测度，从而确定核心元素。
In order to measure the contribution of every element of the system and to determine the most important element, the definition of core degree and core is introduced.
引入了核度与核的概念，以便对系统内各要素对系统的贡献进行测度，从而确定核心元素。
In order to measure the contribution of every element of the system and to determine the most important element, the definition of core degree and core is introduced.
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