speed for maximum endurance

例句：

1. 1. The car accelerates to a speed of 60 miles per hour.
   汽车以每小时60英里的速度加速。
2. 2. The racers need to maintain their top speed to stay ahead.
   赛车手需要保持最高速度才能保持领先。
3. 3. The train will reach its destination in record time if it keeps up its current speed.
   如果火车保持当前速度，它将在记录时间内到达目的地。