This model suggests that, when the relation "parallelogramrule" exists between main stem and sub branches, the total volume of branches is minimal.
该模型认为，当主干与侧枝的截面积之间存在类似平行四边形法则的关系时，分枝的体积取极小值。
2
The paper mainly analyses the cause of crumble, discusses the effective control of the timber crumble and the application of the rule of parallelogram in the process of manufacture.