由于岩石破碎过程非常复杂的，采用当前的动态断裂理论得出的裂纹扩展长度与实测值差异较大。

Because the process of rock broken is very complicated, there is a difference between the experimental data and theoretical result of expanding fissure by the present dynamic fracture theory.

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采用当前的动态断裂理论尚不能定性和定量地解释实测值与理论值之间的差异。

And the difference can not be explained qualitatively and quantitatively by the present dynamic fracture theory.

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