headway
/ˈhedweɪ/noun
1
- mass noun forward movement or progress前进; 进展：
they appear to be making headway in bringing the rebels under control
他们似乎在控制叛乱上获得了进展
the ship was making very little headway against heavy seas.
航船在汹涌的波涛中难以前进。
2
- the average interval between trains or buses on a regular service（火车或公共汽车的）发车间隔：
a six-minute headway.
六分钟的发车间隔。