名词短语
中文翻译：圆周上的伴侣
同义词：
['同伴，伙伴，伙伴例句：1. The cycloid is a mathematical concept that describes the shape of an ellipse.（圆周是描述椭圆形状的数学概念。）']
例句：
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1. The cycloid is a mathematical concept that describes the shape of an ellipse.
圆周是描述椭圆形状的数学概念。
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2.In mathematics, the cycloid is used to model the motion of a point on a circle.
在数学中，圆周用于模拟圆上一点的运动。
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3.The cycloid is also used in physics to describe the path of a particle moving along a circular path.
在物理学中，圆周也被用来描述沿着圆形路径移动的粒子的路径。