vortex axis

例句：

1. 1.The vortex axis of the tornado is where the wind is strongest.
   龙卷风的涡旋轴是风力最强的区域。
2. 2.The axis of symmetry in this model is along the x-axis.
   这个模型的对称轴沿着x轴。
3. 3. The vortex axis is a critical part of the storm's structure.
   涡旋轴是风暴结构中的关键部分。