中文说明：这是SIR微分方程模型对初值问题的求解和作图
English Description：
This is the solution and drawing of Sir differential equation model to the initial value problem
Solution and drawing of Sir differential equation model for initial value problem
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中文说明：这是SIR微分方程模型对初值问题的求解和作图
English Description：
This is the solution and drawing of Sir differential equation model to the initial value problem