step - less speed operation的用法和樣例：
例句
- The spindles motor uses electromagnetic stepless speed regulation ,and adapts to cutting for different materials.
主軸電機電磁無(wú)級調速，適應不同材質(zhì)的裁切。 - Stepless frequency modulated speed,low noise,low vibration driving and smooth running.
速度無(wú)級調速，低噪音，低振動(dòng)傳動(dòng)，運行平穩。
