variable-speed unit

• 无级变速装置

variable-speed unit的用法和样例：

例句

1. Every self-propelled road-going vehicle needs some form of transmission to take the output from its power unit to the driven wheels.
   每一个自带动力驱动的道路行走车辆需要一个变速装置来将发动机的动力传输到车轮。