The change of cultivated land is core of regional land utilization change. It's change and change trend reflects basic state of society economy.
耕地的变化是区域土地利用变化的核心，其变化和流向反映了社会经济的基本态势。
Because population, economy, society, nature, environment and policy are not the same in different regions, the safe problem of population demonstrates the obvious regional characteristic.
由于各区域人口、经济、社会、自然、环境及政策等不尽相同，人口安全问题呈现出明显的区域特征。
Regional logistics network system is a subsystem of regional economy society and an important project of economic integration research.
区域物流网络系统作为区域经济社会的子系统，是经济一体化研究的重要课题。
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