它主要由一钢制长方体和固定在其两端的两个相同直径的钢制圆柱体组成。
It is mainly composed of a steel rectangular parallelepiped and two steel cylinders of the same diameter fixed at its two ends.
例如，桌子是由圆柱体的腿和长方体的顶组成的。
For example, a table could be made up of cylinders for legs and a box for the top.
它使用泳道代替螺旋来表示演进，并且用长方体代替圆柱来描述迭代。
It USES swimlanes instead of spirals to represent evolutions and rectangular solids instead of cylinders to depict iterations.
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