gear shaft

例句：

1. 1. The engine needs to be adjusted for the new gear shaft.
   发动机需要调整以适应新的齿轮轴。
2. 2.The car's gear shaft is damaged, so it won't start.
   汽车的齿轮轴损坏了，所以它不能启动。
3. 3.The engineer checked the gear shaft and found a small crack in the gear teeth.
   工程师检查了齿轮轴，发现齿轮齿上有一个小裂缝。