这类事故其本质是统计性的，其事故次数及首次事故时间是可以用数学模型来表达的。
Such events are statistical in nature and the number of events and the time of first event may be expressed by mathematical mode.
概括针对数学对象的本质属性和共同特征，具有两重性、过程性、层次性的特点。
Generalization is aimed at the essential attribute and common character of mathematics object, generalization has such character as duality, process, and gradation.
因此基于数学模型设计的控制器，在实际应用中就可能受未建模动态和鲁棒性的影响，它们是所有的基于模型的控制理论和技术不可避免的本质问题。
Therefore, the controller designed based on mathematical models may be subject to impaction of unmodeled dynamics and robustness in practical applications, they are inevitable problem in nature.
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