名词
中文翻译：质心
同义词：
['center of gravity', 'center of mass']
例句：
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1.The ball is rolling towards the centre of the field.
球正滚向场地的中心。
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2. The weight of the car is evenly distributed around its centre of gravity.
汽车的重量均匀分布在其质心周围。
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3. The team needs to find their centre of gravity to improve their performance.
球队需要找到他们的质心来提高表现。