headway

n

• ① 前进;进步(=progress)
  • gain headway前进,有进步
  • They were making little headway in the investigation.他们的调查没有什么进展。

• ② (船、火车时间的)间隔
  • The buses are running on five-minute headway.公共汽车每隔五分钟开出一辆。