Any of several glycosides obtained chiefly from plant sources such as the foxglove, used medicinally to increase the force of contraction of heart muscle and to regulate heartbeats.

糖苷中的任一种，主要来源于植物，如毛地黄，用作医药增强心肌收缩的力量并调节心跳。

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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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Blood pressure: Force originating when the heart's pumping pushes the Blood against the walls of the Blood vessels. Their stretching and contraction help maintain Blood flow.

血压：血液作用于血管壁的压力，产生于心脏的泵推作用。血管的舒张和收缩对维持血液的流动有所帮助。

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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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Of course any contraction proposal offered up by Commissioner Gary Bettman would meet the full force of the union.

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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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