英语语法分析

The method in this paper is much more convenient than that of Lekhniskii's with biharmonic function.

本文的方法比列赫尼茨基的重调和函数法更为简便。

Methods Using the fundamental solution of the biharmonic operator, the sequence of fundamental solutions is defined and theoretical derivation is given.

方法利用重调和算子的基本解，定义一基本解系列，进行理论推导。

The expression of the elastic field round the outside of the disk inclusion has been deduced analytically by the method of the harmonic and biharmonic potentials.

本文采用调和势和双调和势法，导出了圆盘形夹杂外部弹性场的解析表达式。