helical staircase

• 螺旋楼梯

helical staircase的用法和样例：

例句

1. Endless Winding Staircase no longer blocks other spiral stairs from being built directly above the first one placed.
   无尽的绕组楼梯不再阻止其他螺旋楼梯从上面直接内建的第一个位置。