多年来研究者们一直致力于开发一种与猫眼石一样有散射特性的合成材料，他们在各种各样的材料中蚀刻图案，但是都无功而返。

For many years researchers have been trying to develop a synthetic material with the same light-scattering properties as an opal, by etching patterns into various materials. That approach has failed.

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如果你们有一个弹性散射，横截面或非弹性散射横截面，那是结合成基本的散射，横截面。

And if you scatter you can have an elastic scattering cross section or an inelastic scattering cross section which are combined to the fundamental scattering cross section.

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在正演过程中，考虑了电磁波在介质中的散射和吸收，使合成剖面更真实化。

In forward modeling, the scatter and absorption of electromagnetic wave in medium are considered, which brings realer synthetic section.

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