本文通过建立一个描述利益群体相互作用的微分动力模型，讨论了其均衡解的存在和稳定性条件。

Through building a differential dynamic model which describes interaction among interest-group, this paper discuss the conditions of existence and stability of equilibrium of the model.

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在两组互动群体之间，都有一个弧形标记相互作用的程度。

Between any two interacting groups, there is an arc which is labelled with the degree of interaction.

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由此可见，女大学生未婚同居，是受社会环境、学校教育、家庭教育同辈群体等影响，及以上各种因素相互作用的结果。

It can be seen from it that cohabitation of female college students are influenced by social environment, family, school education, peer groups and so on, and the interaction of the above elements.

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