manual proportional control system

例句：

1. 1.The manual proportional control system is used to adjust the speed of the car's engine.
   手动比例控制系统用于调整汽车发动机的速度。
2. 2.The manual proportional control system helps to prevent accidents by monitoring the driver's actions.
   手动比例控制系统通过监控驾驶员的行为来预防事故。
3. 3.In this system, the user can manually adjust the settings to suit their needs.
   在这个系统中，用户可以手动调整设置以满足他们的需求。