velocity control knob

例句：

1. 1.The car's speed control knob is located on the steering wheel.
   车的方向盘上有速度控制旋钮。
2. 2. The pilot adjusted the throttle knob to increase altitude.
   飞行员调整了油门旋钮以增加高度。
3. 3. The engineer replaced the faulty throttle knob with a new one.
   工程师用一个新的油门旋钮替换了故障的油门旋钮。