自然边界英文

1. boundary 指地图上明确的界限,汉语一般说“边界线”,如： the boundary between France and Germany 2. border 指沿边界线延伸的地区,汉语一般说“边境”,如： the Franco-German border 3.frontier 的意思是“靠外国的边界” The soldiers guarded the frontiers of the country. Sweden has frontiers with Norway and Finland.

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第三类。自然边界条件(natural boundary condition )一种边界条件。指对容许函数在固定边界上的值不加限制的情形下，极值函数由于使得一阶变分为零而在边界上必须满足的条件。又称黎曼边界条件，可以用来描述两个相接触的物体，在接触面上，磁场强度H的切向分量和磁感应强度B的法向量分量保持连续。一般边界条件有三种形式，分为本质边界条件(狄里克雷边界条件)、自然边界条件(黎曼边界条件)、混合边界条件(柯西边界条件)。