headway time interval

例句：

1. 1. The car was moving at a headway of 50 miles per hour.
   汽车以每小时50英里的速度前进。
2. 2. The team had to wait for the headway before they could start their race.
   队伍在开始比赛前必须等待一段头部间隙。
3. 3. The pilot needed to clear the headway before landing.
   飞行员需要在着陆前清除头部间隙。