The three dimensional design theory of the grooved drum trench curved surface includes: 1)the indirect and direct design of the bottom datum curve;
槽筒沟槽曲面三维设计理论包括：1）槽底基准曲线的间接设计与直接设计；
The three dimensional design theory of the grooved drum trench curved surface includes: 1)the indirect and direct design of the bottom datum curve;
槽筒沟槽曲面三维设计理论包括：1）槽底基准曲线的间接设计与直接设计；
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