fourth speed gear

例句：

1. 1. The car has a four-speed gear system that allows for easyshifting between different driving conditions.
   这辆车有四档速比系统，可以轻松地在不同的驾驶条件下切换。
2. 2. In the race, thedriver must choose the correct fourth gearto maintain maximum speed while still maintaining control.
   在比赛中，驾驶员必须选择正确的第四档来保持最大速度同时仍然保持控制。
3. 3. The mechanic adjusted the car'sfourth gear to ensure smoother acceleration duringthe long drive.
   机械师调整了汽车的第四档，以确保在长途驾驶中更加顺畅的加速。