下游面則由壩頂護至排水棱體，無排水棱體時則護至壩腳。

For those downstream, they protect the space from dam crest to draining prism or to dam heel in event of no prism.

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同時，本系統的開發設計思想和方法不僅適合于棱體成形車刀，還可為其它產品的二次開發提供參考。

Meanwhile, this developed design method for the system not only suits to prismatic-formed turning tools, but offer the UG-based further developing technique of other products as well.

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采用導入燕尾槽模型的方法，利用最小半徑控制點技術實現了棱體成形車刀的基于特征參數化設計；

Importing swallowtail trough model method and utilizing the technique of minimum radius control point, parametric design is realized based on feature on prismatic-formed turning tools.

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