为提高三维有限差分法的计算准确度，本文用地表边条件修改了原来的计算程序。
To improve the accuracy of the numerical evaluation through the 3D finite difference method, the surface boundary conditions are added to modifying the old program.
采用有效的方法对有限元分析结果的准确度进行估测，是十分必要的。
Applying effective measure to evaluate the veracity of FEA result is quite necessary.
采用有效的方法对有限元分析结果的准确度进行估测，是十分必要的。
Applying effective measure to evaluate the veracity of FEA result is quite necessary.
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