丁字尺

例句：

1. 1. He used a ruler to measure the length of the wall.
   他用卷尺测量了墙的长度。
2. 2. The carpenter measured the dimensions of the door before installing it.
   木匠在安装门之前测量了它的尺寸。
3. 3. She used her ruler to draw a straight line on the paper.
   她用直尺在纸上画了一条直线。