self-acting idler

例句：

1. 1. The self-acting idler is designed to automatically start the engine when the vehicle is started.
   自激式怠速器设计为在车辆启动时自动启动发动机。
2. 2. In this car, the self-acting idler is a crucial component that ensures smooth operation of the engine.
   在这个汽车中，自激式怠速器是一个关键的组件，确保发动机的平稳运行。
3. 3. The self-acting idler is an important safety feature that prevents the engine from overheating in cold weather.
   自激式怠速器是一个重要的安全特性，防止了引擎在寒冷天气中过热。