直角尺

例句：

1. 1. He measured the length of the wall with a square ruler.
   他用直尺测量了墙的长度。
2. 2. The engineer used a square ruler to mark the corners of the building.
   工程师用直尺标记了建筑物的角落。
3. 3. The teacher showed us how to use a square ruler for drawing straight lines.
   老师教我们如何使用直尺画直线。