树枝分叉的方式都一样，树叶的形状普遍相似，河流总是蜿蜒前进，飘落的雪花都是基本的六边形。

Trees branch in a consistent way, leaves take their genetic form, rivers carve a sinuous route, snowflakes fall in their basic hexameter shape.

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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.

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根据埃洛伊的模型，每个母树枝分叉形成的子树枝，都具有相近的角度和方向，以及相同的数量。

For Eloy's model, this meant that every time a larger branch split into smaller branches, it split into the same number of branches, at approximately the same angles and orientations.

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