spiraein

例句：

1. 1. The spiral staircase leads to the top floor.
   螺旋楼梯通向顶层。
2. 2. The coiled spring is ready to be stretched.
   卷曲的弹簧准备好了要拉伸。
3. 3. The helix of the galaxy is a fascinating study of geometry.
   银河系的螺旋是几何学的迷人研究。