实线

例句：

1. 1. The engineer drew a solid line on the map.
   工程师在地图上画了一条实线。
2. 2. The car was parked in a solid line.
   汽车停在了一排整齐的实线上。
3. 3. The teacher marked the solid line with a pencil.
   老师用铅笔在实线上做了标记。