本文讨论了关于边界电位作线性变化的正方形结构静电四极场；

We describe an exact quadrupole field with square cross-section in which the boundary potential varies linearly with position.

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通过想像正方形网格或六边形单元，可以方便地可视化数据结构(实践中，应用程序在多数情况下采用正方形网格)。

You can easily visualize the data structure by imagining a grid of square or hexagonal cells. (in practice, applications use square cells most of the time.)

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纯朴且无结构正装的设计灵感来自正方形。

Pure, unstructured pieces are inspired by the square.

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