因为Python并不完全支持局部变量，你不得不创造一种数据结构，来接受n的值。
Because Python doesn't fully support lexical variables, you have to create a data structure to hold the value of n.
描述路径的线性多边形列表对移动来说是一个灵活的数据结构，它可以局部调整寻路实体的移动位置。
Thelinear list of polygons describing the path is a flexible data structure forsteering, and it can be locally adjusted as the agent's position moves.
为了实现数据对应用程序的独立性，应用程序自行定义所需要的局部逻辑数据结构。
In order to keep the data independence from application program, the necessary local logical data structure can be self-defined in every individual application program.
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