这个差异可能由分段光滑映象函数的非线性造成。
And this difference may be induced by the nonlinear function of piecewise-smooth map.
如果是分段光滑的，即是由几段光滑曲线连接起来的。
If is piecewise smooth, that is, consists of several smooth curves joined together.
结论应考虑使用分段光滑模型来建立新的微观交通模型。
Conclusion Piece-wise smooth mathematic model may be used in establishing new traffic model.
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