The factor of the mixed partial derivative term controls the grid orthogonality. The other two factors of second order partial derivative terms control the grid spacing.
结果表明 ：方程中混合偏导数项系数具有控制网格正交性的作用；
The factor of the mixed partial derivative term controls the grid orthogonality. The other two factors of second order partial derivative terms control the grid spacing.
结果表明 ：方程中混合偏导数项系数具有控制网格正交性的作用；
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