The relation of length force and force velocity are two important characters for skeletal muscle contraction, but there is still limitation when describing the nature of skeletal muscle.
长度—力和力—速度关系是骨骼肌收缩的两个最重要的性质，但用其描述骨骼肌性质时仍有局限性。
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.
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。
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.
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。
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