此类波场外推算子沿深度层进行波场外推，都存在参考速度选择问题。

All extrapolation operators face the problem of choosing the reference velocity due to continuation in depth.

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结合旋量理论与递推算子可以直接得到易于计算机编程实现的广义雅可比矩阵。整个计算过程简单、效率高。

Then it can avoid the analysis of the coupling between base and manipulator, so the Jacobian matrix can be achieved simple and efficiency.

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为了给出图像类推算法的适用范围，提出了一种新的基于分形维数向量的图像的相似性度度量算子。

To give applicable range of image analogies algorithm, based on the fractal dimension vector, a new operator used to measure the image similarity is proposed.

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