starter ring gear

例句：

1. 1.The starter ring gear is essential for starting the engine.
   启动环齿轮对于启动发动机至关重要。
2. 2.The starter ring gear was designed to ensure smooth engine operation.
   启动环齿轮被设计来确保发动机的平稳运行。
3. 3. The starter ring gear failed, causing the car to stall.
   启动环齿轮失效，导致汽车熄火。