Using contraction theory dealing with track convergence, cope with controller and observer as a whole, bring forward a sufficient condition to design nonlinear system.

利用处理轨迹收敛的收缩理论，把控制器系统和观察器系统看作一个整体方式处理观察器设计问题，给出了非线性系统的观察器设计的一个充分条件。

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Contraction principle is an important constitution of large deviation theory.

收缩原理是大偏差理论的重要组成部分。

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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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