以弹性波为重点，评述了三锥散射算子关系及其在逆散射中的应用。为便于理解，在介绍过程中，还仔细描述一维球对称情况下散射矩阵和逆散射方程推导。
The three-dimensional scattering operator formulations with application in the three-dimensional inverse scattering are reviewed with emphasis on the elastic wave case.
当距离锥顶还有三米时，观察员通过无线电告诉他岩浆的活动水平，在哪里爆发，什么时候溢出。
When he was ten feet from the top, spotters described to him over the radio the level of the lava, where it was exploding, where it was spilling over.
火山口中间是火山灰锥，投下了三角形的暗影。
An ash cone rises from the center of the crater, casting a dark triangular shadow.
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