单连通和非单连通的概念，研究哪些环路能界定曲面，可以用来对空间内部物体的形状进行分类。
This concept of being simply connected or not, and studying which loops bound surfaces or not can be used to classify shapes of things inside space.
转身数的总和必须是零，这是为了避免陷入某些环路，比如大写字母 G形状的环路（在纸上试着走一下这个形状，就会明白我的意思）。
The requirement that your turns sum to zero is necessary to keep you from getting caught in certain loops, such as one shaped like a capital G (try it out on paper to see what I mean).
本文提出了一种把像素模拟与环路积分算法相结合，计算复杂形状面目标有效毁伤面积的新方法。
To calculate valid damage area of irregular targets, this paper creates a new method combine pixel simulation with circuit integral algorithm.
本文提出了一种把像素模拟与环路积分算法相结合，计算复杂形状面目标有效毁伤面积的新方法。
To calculate valid damage area of irregular targets, this paper creates a new method combine pixel simulation with circuit integral algorithm.
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