speed variation for energy saving

• 调速节能

speed variation for energy saving的用法和样例：

例句

1. The running result indicates that the adoption of high voltage inverter in the dust removal air blower is successful and the effect of saving energy is distinct.
   变频器现场运行情况表明，冶金行业采用国产高压变频器对配料除尘风机进行调速节能，改造是成功的，节能效果是明显的。