在具有社会关系结构的经济系统及通讯网络系统等许多现实的系统中，人们经常关注节点集在系统中的重要性问题。
Nodes' importance is often concerned in many real world systems, such as economic systems with social relation structure and communication networks.
学费定价研究是现实关注的热点，也是教育经济理论研究的焦点。
Tuition pricing is the focus on reality and theory of education economics.
在理论分析的基础上，文章转而关注中国现实经济生活。
On the foundation of theories analyzing, the article turned to pay attention to the Chinese economy life.
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