突然，我们想到我们可以使用部分UML的图元，同时要加上一些新的约束条件。
We suddenly think that we can use some UML graphic element but we add some new restrict condition.
对球体图元的装箱问题直接给出光滑的优化模型，依据变分分析的最优性理论建立了最优性必要条件。
As to the problem of packing balls, a smooth model is given and the corresponding optimality conditions are established by the optimality theory of variational analysis.
重点研究了构成图元的线元间几何关系特征的判定方法与判定条件。
The main research about its is geometrical relation's deducible method and condition between line units of which graphics unit consists.
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