其基本思想是利用与多边形两条边或三条边等距离的点的轨迹。

Its basic idea is to use the locus of the points, which are equidistant from two or three sides of a polygon.

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同等距离之原理：选择与各个服务点同等距离的住宿（如：旅馆）。

The Principle of Equidistance: Choose lodging (eg. hotel) equidistance to all Service Points.

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找一段中等距离长的盘山路进行，或者在跑步机上模拟中等距离的山坡跑。

Find a rolling course the length of a medium-distance run or use a treadmill to simulate a medium-distance hilly course.

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