lowest speed

例句：

1. 1. The car is traveling at its lowest speed.
   汽车以最低速度行驶。
2. 2.The train has the lowest speed of any vehicle on the line.
   火车是这条线路上所有车辆中速度最低的。
3. 3.The aircraft is flying at its lowest speed to avoid a collision.
   飞机正在以最低速度飞行，以避免碰撞。