This paper provides an arithmetic method based on rigorous model for dynamic simulation and solving methods for the former system.

对前者建立了基于机理模型的动态模拟模型算法，给出了具体的求解方法。

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The word sketchy here is not pejorative because millennia of philosophy of language have shown how hard (or even impossible) it is to come up with a truly rigorous model of natural language.

这里说粗略并非轻视，因为数千年来的语言哲学表明要建立自然语言真正严格意义上的模型是很难的(甚至是不可能的)。

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Simulation results show that the simplified model provided by this method can satisfactorily imitate rigorous model in addition to its simple structure and feasibility for on line applications.

仿真结果表明，用本文提出的简化模型能较好地逼近基于偏微分方程的严格模型，且结构简单，易于应用。

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Citigroup joins peers Bank of America, UBS and Barclays who are all undergoing a process of rigorous business model streamlining.

FORBES: How Citigroup's Reorganization Can Lift Its Share Value

We have rejected the historically successful model of rigorous, classical education in favor of entertainment and job training.

FORBES: The Un-Education of a Nation: Where We Went Wrong

Unfortunately, for both students and the employers who would hire them, the increasing difficulty in securing the work experience necessary to demonstrate competency sans degree favors the less-rigorous test it and forget it model of competency-based learning.

FORBES: A BA In Burger Flipping: Is College Credit In Exchange For Life Experience A Fair Trade?