如在简单的机器上的区段所指出的，一个螺丝钉以一个楔住行动行事而且有圆形圆筒(或者切断了圆锥体)与一螺旋状的在它里面的凹槽。
As indicated in the section on simple machines, a screw ACTS with a wedging action and consists of a circular cylinder (or truncated cone) with a helical groove in it.
具有螺旋状的螺转体的，塔楼状的，如某些有高螺旋圆锥体的腹足类动物的壳。
Having the shape or form of a turret, as certain long-spired gastropod shells.
另一种是近似圆锥体的母线是向锥体外凸出的曲线。螺旋叶片垂直于锥体表面。
Said spiral blade has a spiral curve extended from the tip of conic body.
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