这条的规律可以简单描述为：如果一根树干分叉为两个树枝，那么两个树枝的横截面积之和等于树干的横截面积；如果树枝接着分别分叉为两根小树枝，那么这四个次生分枝的横截面积总和仍等于树干的横截面积……依此类推。
If those two branches in turn each split into two branches, the area of the cross sections of the four additional branches together will equal the area of the cross section of the trunk. And so on.
根据分枝结构的外形特征，把分叉结构归纳为三种模板模型。
Three types of model templet, which are created depending on characteristic of branching structure, are used as the module of L-systems.
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