政策和制度是大城市边缘区形成演变保障机制的两个关键因素。
Policy and system are two major elements affecting the development of suburban areas.
核心通过制度化的多边合作机制联系着周边国家，但从核心到边缘存在着等级区别。
The two cores are linked with peripheral states with institutionalized multilateral cooperative mechanisms, but there is a hierarchical difference between the core and periphery.
但由于种种制度障碍，我国还没有建立起针对农民工的社会保障制度，农民工事实上已成为城市的边缘群体。
However, due to various obstacles to the system, our country has not set up for migrant workers social security system, migrant workers has become a matter of fact the edge of the city's population.
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