spiral hoop-iron

例句：

1. 1. The spiralhoop-iron isused to secure the roof of thehouse.
   螺旋箍铁用于固定房屋的屋顶。
2. 2.The spiral hoop-iron wasdesigned to prevent leaks in the roof.
   螺旋箍铁的设计是为了防止屋顶漏水。
3. 3. Thespiral hoop-iron was apopular choice for securing heavy objects on theroof.
   螺旋箍铁是固定重物在屋顶上的一个受欢迎选择。