Yet the full nonline problem is difficult to solve by use of traditional Euclidean geometry method, even the numerical solution cannot be got, so it puzzled researcher nearly half century.

• 然而这些沉积生成的枝晶，其形貌上呈现出的极不规则、极其复杂的几何特征，这一非线性的生长问题用传统的欧氏几何来处理是十分困难的，甚至于无法获得数值解，所以在近半个世纪以来一直困扰着科学工作者。