frontage line

例句：

1. 1. The car's frontage line is damaged in the accident.
   汽车的前缘线在事故中受损。
2. 2.The engineer drew a frontage line on the map to indicate the construction site.
   工程师在地图上画了一条前缘线，以标示施工场地。
3. 3. The military was ordered to maintain a frontage line of defense.
   军队被命令保持防线。