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。
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。
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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