free-running speed

例句：

1. 1. The aircraft's free-running speed is 200 knots.
   这架飞机的自由运行速度是200节。
2. 2. The racers are racing at their free-running speed.
   赛跑者正在以他们自由运行的速度比赛。
3. 3. The project aims to achieve its free-running speed within six months.
   该项目旨在在六个月内达到其自由运行速度。