在一些实施例中，侧壁由一系列近似为抛物线区段的内连接线段限定。

In some embodiments, the sidewalls are defined by a series of inner-connected lines segments approximating a parabolic section.

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对于大量的钮扣，或节点，随着连接线段或边缘线数量的增加，系统突然从离散的断开的小群跳转到一个巨大的连接群。

For a large number of buttons, or nodes, as the number of connecting lines or edges increases, the system rather suddenly jumps from disconnected small clusters to a giant connected cluster.

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