名词
中文翻译：圆心
同义词：
['inscribed circle', 'inscribed sphere']
例句：
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1.The involute of the circle isa circle that touches the center of thecircle.
这个圆的内接圆是与圆相切的圆。
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2. The involute of the sphere is asphere that touches the center of thesphere.
这个球的内接球是与球相切的球。
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3. Theinvolute of the cone is acone that touches the center of the cone.
这个锥的内接锥是与锥相切的锥。