scratch line

例句：

1. 1.The car's scratch line was barely visible on the rearview mirror.
   汽车后视镜上的划痕几乎看不见。
2. 2.The artist drew a scratch line across the canvas to indicate the beginning of his next stroke.
   艺术家在画布上划了一条划痕线，表示他下一步的笔触开始。
3. 3.The old map had many scratch lines indicating where the roads had been built.
   旧地图上有很多划痕线，标示了道路的建设位置。