A small section of procedures for drawing traffic forecast decision tree.
自己编的一段小程序，绘制交通事故的预测决策树。
Increase length, decrease cross-section, called drawing out the metal.
增加长度、减小横截面，称为延伸金属。
Every section has a chord, which will be temporarily specified by lots drawing on site;
每小节一个和弦，和弦进行在现场临时抽签指定；
Every section has a chord, which will be temporarily specified by lots drawing on site;
每小节一个和弦，和弦进行在现场临时抽签指定；
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