名词短语
中文翻译：中心平均距离
同义词：
['mean center distance', 'average center distance']
例句：
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1. The center of the circle is at the point where the diameter intersects the circumference.
圆的中心是直径与周长相交的点。
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2. The center of gravity is the point where all forces are balanced.
重心是所有力平衡的地方。
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3. The center of the Earth is located at the center of the solar system.
地球的中心位于太阳系的中心。