step vane

例句：

1. 1. The wind is blowing the sails of the ship, and the captain is adjusting the steps to keep the ship on course.
   风吹动着船帆，船长正在调整舵轮以保持航向。
2. 2. The steps of the staircase are worn smooth by many people's feet.
   楼梯的台阶被许多人的脚磨得光滑。
3. 3. The steps of the mountain trail were slippery with ice and snow.
   山间小径的台阶因积雪和冰而滑。