床柱是螺旋形的。

The bedposts are ___spiral.

落叶在风中盘旋而下。

The leaves ___spiraled down in the wind.

公司的亏损开始失控地加剧。

The company's losses started to ___spiral uncontrollably.

台风的风暴云呈现出明显的螺旋形状。

The storm clouds of the typhoon formed a distinct ___spiral shape.