通过分析GM（ 1 ，1 ）模型白化形式微分方程的解析表达式，导出了求解GM（ 1 ，1 ）的精确离散化模型。

By analyzing the differential equation for GM(1,1), this paper deduces one accurate discretization model to solve GM(1,1) model.

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建立起数学模型并离散化，然后用微机编程求解微分方程组。

Then with a substitutes' dispersion of difference scheme the partial differential equations of the above model were programed on a computer.

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用微分方程建立连续型传染病模型的研究较多，但是研究离散模型的较少。

There have been many studies of continuous epidemic model through differential equations, but little research on discrete models.

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