4．模型四：农民务工收入(IPPW)与城乡差距(IGAP)回归分析。接下来用EG两步法对IPPW_CPIR（用CPIR折算后的IPPW）和IGAP进行协整分析，发现二者是协整的；然后进行Granger因果检验...
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教育制度供给短缺与不当是造成城乡教育差距的根本原因。
The Inadequate and inappropriate supply of education System is the fundamental reason of Urban-rural gap in education.
所以找出我国主要城市集聚与扩散的转换规模能为缩小我国城乡差距做出一定的贡献。
Therefore, the thing finding out the conversing scale of aggregating and diffusing makes some contribution to narrow the gap between urban and rural areas in China.
结论：城乡间孕妇营养和健康状况存在差距，应加强城乡间孕妇的营养与健康监测。
Conclusion: the nutritional and health status of pregnant women in rural and urban was different significantly, so the surveillance should be strengthened.
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