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复数形式
protractors
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量角器, 分度规
a measuring instrument used to measure and draw angles
A protractor is a tool used to measure and draw angles. It is usually a flat, semicircular or circular device marked with degree measurements from 0 to 180 or 360. The protractor has a straight edge for aligning with a line or point, while the curved side is used to measure the angle between two meeting lines. Protractors are commonly used in geometry, drafting, carpentry, and construction to ensure accurate angle measurements for various projects. They come in different sizes and types, including digital versions for easier reading.
- The teacher used a protractor to show how to measure angles in the geometry lesson.
老师在几何课上用量角器演示如何测量角度。
- To build the frame correctly, the carpenter needed a protractor to check the angle between the two beams.
为了正确构建框架，木匠需要一个量角器来检查两根梁之间的角度。
- The protractor helped the student draw precise angles for the math assignment.
量角器帮助学生为数学作业绘制精确的角度。
- Before cutting the wood, the contractor used a protractor to ensure the angle was exactly 45 degrees.
在切割木材之前，承包商使用量角器确保角度正好是45度。
- The engineer used a protractor to measure the angle of the roof in the blueprint.
工程师使用量角器来测量蓝图中屋顶的角度。