1. step up
   v.走近,逐步增加,提升,提高
   
2. step-up transformer
   升压变压器，升压器
   

1. Production of oil stepped up with new methods.
   新的石油生产法可以把产量提高。
2. There are two steps up onto the Bus.
   上公共汽车有两级踏板。
3. A step up in the corporate hierarchy.
   在社团等级中晋升一级
4. Radio traffic has stepped up enormously.
   无线电通讯已大大增加。
5. He finally stepped up to the top.
   他终于爬到顶上去了。

　1个名词解释