protractor [proˈtræktɚ, prə-]

例句:

• Use your protractor to construct an equilateral triangle.
  用量角器作一个等边三角形.
  
• This compass serves as a protractor.
  这个罗盘可用作分度规.
  
• To draw to scale by means of a scale and protractor; plot.
  测绘用圆规和量角器划线和角; 标绘.
  
• Since no one in my office has a protractor, does anyone have any tips on how I can check that I'm sitting at the correct angle?
  来自BBC
• Using a protractor, measure the angle formed where the base of the plane meets the floor.
  来自SA
• Use the protractor to confirm the angle formed where the base of the plane meets the floor.
  来自SA