讨论了弹性波多普勒效应的叠加性质，并指出相对论的时间膨胀和长度收缩对弹性波多普勒效应的影响。

The superposition property of elastic wave's Doppler effect and the influence of relativistic time dilation and length contraction on elastic wave's Doppler effect are also discussed.

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如果承认存在绝对参考系，按斐兹杰惹-洛伦兹长度收缩效应和洛奇·洛伦兹时间延缓效应，就可以消除滑落悖论。

If the absolute reference frame is admitted, in accordance with FitzGerald-Lorentz length contraction effect and Lodge-Lorentz time dilation effect, the slide down paradox can be eliminated.

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本文应用洛仑兹变换和信号的传播速度小于光速，解释了洛仑兹长度收缩佯谬，具体证明了在不同参照系上的观测者，观测所得结论相同。

By using Lorentz transformation, this article explains the paradox of Lorentz length contraction, it also proves that observers in different reference systems reach the same observing conclusion.

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