名词
中文翻译：延长器头部
同义词：
['extension head', 'extension headpiece例句：1. The protractor head is used to measure the angle between two points on a plane.（延长器头部用于测量平面上两点之间的夹角。）']
例句：
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1. The protractor head is used to measure the angle between two points on a plane.
延长器头部用于测量平面上两点之间的夹角。
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2.The protractor head was used to help me measure the distance between my desk and the window.
延长器头部帮助我测量书桌和窗户之间的距离。
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3. The protractor head was used to adjust the angle of the camera lens for better focus.
延长器头部用于调整相机镜头的角度，以便获得更好的焦点。