Characteristic schools are a possible result of the connotative development of primary and secondary schools,and objectively form characteristic school groups.From the perspective of the evolution trend of primary and secondary school development,the development of characteristic school groups has experienced an overall up-grade and regression of"ordinary schools—characteristic schools—post ordinary schools".In terms of development degree,schools have upgraded from schools with potential characteristics to characteristic schools.In terms of de-velopment trend,schools have returned from characteristic schools to ordinary schools.After experiencing the de-velopment stage of characteristic schools,primary and secondary schools have gained a new development back-ground and become higher level ordinary schools.The upgrading and regression of characteristic school groups is a spiraling development process in primary and secondary schools,and is a condensed fragment of the evolution of school development.
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