长圆规

例句：

1. 1. He used a long straight ruler to measure the length of the wall.
   他用一把长直尺来测量墙的长度。
2. 2. The teacher asked the students to use a long straight ruler to draw the circle.
   老师要求学生们用长直尺画圆。
3. 3. The engineer used a long straight ruler to mark the center of the building.
   工程师用长直尺标记建筑物的中心。