n.一步舞；单步舞曲
vi.跳单步舞
A road of a thousand mile begin with one step. 千里之行，始于足下。
One step, two steps. Tickle you under there. 一个台阶，两个台阶。在那里咯吱你。
She's moving up the ranks one step at the time. 便是一个很好例子。它也有慢慢来,一步一个台阶,从底层做起的意思。
The cops were always one step behind him. 条子总是比他慢一步。
AOP takes things one step further. AOP更进了一步。
