保护大城市边缘区及其附近的开敞空间及其他资源；
Protecting the edge areas and the open spaces of the big cities;
准确把握大城市边缘区的概念与本质特征是问题研究的基础。
To precisely understand the concept and the attributes of urban fringes is the basis of the study.
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.
因此，研究大城市边缘区小城镇成长机制具有十分重要的现实意义。
Therefore, the research of growth mechanism of small cities and towns of metropolitan fringe has all-important realistic significance.
有关大城市边缘区的研究，在国外开始于70年代早期，目前已成为国外城市学界研究的主要课题之一。
Today, the research on fringe area of big cities' which began in early 1970's have become one of major subjects in the urban science.
大城市边缘区小城镇处在一定的经济区域中，受到大城市的辐射、扩散和周围农村腹地的双重影响，更是具有举足轻重的作用。
The small cities and towns of metropolitan fringe were placed in the certainly economic district inside and affected by the radiation and proliferation of the big city and periphery country region.
大城市边缘区小城镇处在一定的经济区域中，受到大城市的辐射、扩散和周围农村腹地的双重影响，更是具有举足轻重的作用。
The small cities and towns of metropolitan fringe were placed in the certainly economic district inside and affected by the radiation and proliferation of the big city and periphery country region.
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