平行直尺

例句：

1. 1. He used a parallel ruler to measure the length of the wall.
   他用平行直尺测量了墙的长度。
2. 2. The engineer used a parallel ruler to check the accuracy of the measurements.
   工程师用平行直尺检查了测量的准确性。
3. 3. The student used a parallel ruler to draw a straight line on the paper.
   学生用平行直尺在纸上画了一条直线。