instruction tracing

例句：

1. 1.The teacher used the whiteboard to demonstratehow to perform this instructional tracingexercise.
   老师使用白板演示如何执行这个指导跟踪练习。
2. 2. The student was instructedto trace the path of the arrow withtheir finger.
   学生被指示用手指跟随箭头的路径。
3. 3. The engineer used a computer programto trace the movement of the robot arm.
   工程师使用计算机程序来追踪机器人手臂的运动。