engine starting gear

例句：

1. 1.The engine started with a loud click.
   发动机发出了响亮的咔哒声。
2. 2. The starter gear was the only thing that worked.
   启动器齿轮是唯一起作用的东西。
3. 3. The car's engine started smoothly after the jump.
   汽车在跳起后顺利地发动了。