spiral-staircase coil

例句：

1. 1. The spiral staircase is intricately designed to provide a smooth and safe climb.
   螺旋楼梯设计精巧，提供平稳安全的爬升体验。
2. 2. The spiral coil is used in the manufacturing process to reinforce the material.
   螺旋线圈在制造过程中用于加强材料。
3. 3. The spiral coil was found to have a unique property that could be useful in various applications.
   螺旋线圈被发现具有独特的性质，可以在各种应用中发挥作用。