half axle gear

例句：

1. 1. The car has a half axle gear that makes it easy to drive.
   这辆车有一个半轴齿轮，使得驾驶变得容易。
2. 2. The new model car uses a half axle gear system to improve fuel efficiency.
   新款汽车采用了半轴齿轮系统来提高燃油效率。
3. 3.The old farm tractor had a half axle gear that was difficult to replace.
   旧农用拖拉机的半轴齿轮难以更换。