... finite-amplitude instability 有限振幅不稳度 finite-difference approximation 有限差分近似 finite-difference equation 差分方程 ...
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这被称为有限差分近似 finite-difference approximation
灵敏度系数矩阵是通过有限差分方法近似计算得到的。
The sensitivity matrix was calculated numerically by the finite difference method.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction.
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