The author makes an initial discussion on how to clarify the origin and theoretical basis of infinitesimal method during the teaching of this very method in the application of definite integral.
针对在定积分应用的微元法教学过程中，就如何阐明微元法的来源、理论依据以及在实际应用中需注意的问题等进行初步的探讨。
The physical meaning is clear and definite when integral calculus method is adopted to establish the basic equations of traffic flow.
采用积分方法建立交通流基本方程的物理意义更为明确。
The definite integral can be calculated with the integration function in MATLAB or can be solved by using the Monte Carlo programming method.
该定积分可用MATLAB提供的积分函数计算，或者利用蒙特卡罗方法通过编程求解。
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