螺线

螺线（spiral）是指一些围着某些定点或轴旋转且不断收缩或扩展的曲线。

**二维螺线**
 费马螺线- 等角螺线- 双曲螺线- 圆内螺线- 阿基米德螺线- 连锁螺线- 柯奴螺线- 欧拉螺线

**三维螺线**
 螺线管

**参考文献**
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