B-spline is the most popular method to present free-form curve and surface, and DP algorithm is the effective approach for solving discrete optimization problems.

样条方法是当前自由曲线曲面造型最为常用的方法，动态规划为解决离散最优化问题的有效手段。

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The shape of streamlined train head is made of the 3-dimensional space free form surface, whose shape outline curve USES NURBS curve and complex shape surface USES 3-d NURBS surface.

基于流线型的列车头部外形由三维空间自由曲面构成，提出采用NURBS曲线设计外形型线和用三维nurbs曲面描述复杂三维曲面的车头外形设计方法。

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