名词
中文翻译：Unknown
同义词：
['quadratic sphere', 'quadratic sphere']
例句：
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1. The quadrantal sphere is used to measure the angle between two points on a plane.
四分仪球用来测量平面上两点之间的夹角。
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2. The quadratic sphere was used in ancient times to calculate the distance between cities.
古代用二次球来计算城市之间的距离。
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3. The quadratic sphere is also known as the ellipsoid of revolution.
二次球也被称为旋转椭球。