衍射则是电波绕射传播到遮蔽区的现象。
The diffraction effect is the phenomenon of wave propagation into shadow region.
但由于此两种方法的波散现象，存在绕射波收敛不完全等问题。
Merely the wave dispersion, the convergency of diffracted wave is, in most cases, incomplete.
该模型将爆炸波在岩土中的自由场传播与遇到结构后产生的波反射、绕射、透射等现象相结合考虑。
The finite element model includes wave reflections, diffraction, and transmission when the shock wave encounters the structure.
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