在比较半无限平面大地模型和四周无限大地圆形隧道模型基础上，提出电气上的长大隧道概念。
Based on model comparison between the semi-infinite earth and the circular tunnel with peripheral infinite earth, the conception of long and large tunnel in the electrical meaning is put forward.
以一新的形式给出平面域上“距与位值”的概念，并得到若干性质，在此基础上建立了二元关联函数及其可拓域。
In this paper, "distance and place value" is expanded to the plane region by a new method, the definitions of their are given, and some theorems are obtained.
本文在指出传统城市都是基于“平面模式”，并分析其利弊的基础上，提出未来立体化城市的概念。
Based on "plan pattern" traditional citys shortcoming the three dimensional future city which meets the demand of human beings and ecology in future is put forward in the paper.
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