tracing routine

例句：

1. 3.
   在地图上
2. 1. The detective was trying to trace the criminal's movements.
   侦探试图追踪罪犯的行踪。
3. 2. She traced her finger on the map and followed the route.
   她在地图上用手指勾勒出路线，并跟随它。
4. 3. The artist used a pencil to trace the outline of the building.
   艺术家用铅笔勾勒出建筑物的轮廓。