This paper gives a description of three-dimensional method for studying structure of the earth's interior and its recent progress, putting emphasis on the inversion method of seismic body waves.
本文介绍了近十年来研究地球内部结构的三维地震反演方法及其进展，重点放在对地震体波反演方法上。
There are two chief kinds of seismic waves: body waves and surface waves.
有两种主要的地震波：体波和面波。
Body waves, the fastest seismic waves, move through the earth.
体波是最快的地震波，可贯穿地球。
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