机械波的形成需要振源和介质。
A vibration source and a medium are needed to form a mechanical wave.
因此，扰动就趋于增强而引起冲击波的形成。
Hence disturbances tend to grow, giving rise to the formation of a shock wave.
沙波的形成是典型的简单巨系统自组织现象。
The formation of sand wave is a typical self organization phenomenon of simple giant systems.
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