中文说明：设定一初始值，套用for循环 ，根据Euler法，求解微分方程组，用plot画出其解得曲线图和相平面图
English Description：
Set an initial value, apply for circulation, according to the Euler method, solving differential equations, plot to draw their graphs and Planar graphs
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中文说明：设定一初始值，套用for循环 ，根据Euler法，求解微分方程组，用plot画出其解得曲线图和相平面图
English Description：
Set an initial value, apply for circulation, according to the Euler method, solving differential equations, plot to draw their graphs and Planar graphs