three step

• adj. 三级的

three step的用法和样例：

例句

1. On my way home, I imagined that every hale tree in the distance was a man; and stopped every two or three steps to look behind me.
   在回家的路上，我设想远处的每一棵小树都是一个人; 每走两三步我就停下来往后看一看。