balance rider

例句：

1. 1. The balance rider is responsible for ensuring the stability of the vehicle during the ride.
   平衡骑手负责确保车辆在骑行过程中的稳定性。
2. 2. The balance rider must be skilled in controlling the vehicle's speed and direction.
   平衡骑手必须擅长控制车辆的速度和方向。
3. 3. The balance rider helps to maintain a stable riding position for the rider.
   平衡骑手帮助保持骑手的稳定骑行姿势。