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。

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Muscle cell electrolyte composition is essential for nerve-muscle contraction force.

肌肉细胞电解质的组成是不可或缺的神经，肌肉收缩力。

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According to the analysis of the speed force of muscle contraction in track and field, the author point out the power training theory.

通过对田径运动中肌肉收缩速度力量分析，提出了提高运动员专项速度力量的训练原理。

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Moreover, the growth of two-income households cannot be blamed for the relative contraction of the labor force.

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Given that people who move to Russia tend to be of working age, the working age population has stabilized in contrast to earlier expectations of a rapid contraction in the labor force.

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The NAHB is worried that the contraction in construction lending by community banks will force more small builders out of business resulting in more job losses industry wide and across the country.

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