双闭环PWM可逆直流调速系统的翻译：Double closed-loop PWM DC reversible speed governing system 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Dual closed-loop pwm reversible DC Speed ??Control System

Double closed-loop PWM DC reversible speed governing system

Double closed loop PWM reversible cocurrent velocity modulation system

Double-loop PWM reversible DC variable speed system

Double closed-loop PWM DC reversible speed governing system