名词短语
中文翻译：中心之间
同义词：
['centers of gravity', 'center of gravity']
例句：
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1.The ball is between the two centers of the court.
球在球场的两端之间。
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2. The weight of the planets is balanced by the centers of gravity.
行星的重量由重心平衡。
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3.The balance between the two countries was critical to their relationship.
两国之间的平衡对它们的关系至关重要。