通过直接积分得到了有限长密绕矩形螺线管自感系数的精确表达式，并对结果进行了图示和讨论。
The exact expression is obtained by integration method for a tightly wound rectangular solenoid of finite length, the result is plotted and discussed.
本文给出新的数学表达式，能用图示法形象直观地描绘出“8”字形轨迹，并简明地给出“8”字形的高度和宽度。
In this paper, we give a new mathematical representation, which can present the "8" -shape trace visually with graphic representation and give height and width of the "8" -shape trace in a simple way.
一张图示可以展现以及表达一种模型，同样的，一段仔细斟酌的代码可以，一句英文也可以。
A diagram can represent and communicate a model, as can carefully written code, as can an English sentence.
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