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1·The river forms a natural boundary between the two countries.

那条河在这两个国家之间形成一条自然边界。

2·The last two integrals correspond to the natural boundary conditions.

最后两个积分对应于自然边界条件。

3·The Rio Grande River forms a natural boundary between Mexico and the United States.

格兰德河是美国和墨西哥之间的天然界河。

4·In this paper we discuss the natural boundary element method for harmonic equation in an exterior elliptic domain.

本文以调和方程为例，研究椭圆外区域上的自然边界无法。

5·Based on the natural boundary integral equation for two dimensional elasticity, a corresponding elastoplastic formulation is presented in this paper.

以二维弹性力学自然边界积分方程法为基础建立了二维弹塑性问题的自然边界积分方程。

6·These algorithms are given by both the finite element A- method and the nonoverlapping domain decomposition method based on the natural boundary reduction.

这些算法采用了有限元A-法和基于自然边界归化的非重叠型区域分解算法。

7·The effect of imposing natural boundary condition as constraints is considered and it is shown by a plate bending problem that this effect is quite superficial.

文中对自然边界条件作为约束条件的影响给予了考虑，并以板的弯曲问题为例说明影响极微。

8·By using Green function, the boundary integral formula and natural boundary integral equation for the boundary value problems of biharmonic equation were obtained.

利用Green函数，根据双调和方程边值问题的边界积分公式和自然边界积分方程。

9·In this paper, we investigate the natural boundary element method for the boundary value problem of harmonic equation in an exterior elliptic infinite sector domain.

研究了椭圆外无穷扇形区域上调和方程边值问题的自然边界元法。

10·The characteristic of this model is only to know basic and natural boundary condition, then the stream function and flow velocity required on the boundary are obtained.

这一模型的特点只需要知道边界上的基本边界条件和自然边界条件，就可以得到边界上所需要求的流函数和水流速度；