名词
中文翻译：质量中心
同义词：
['mass center', 'gravity center']
例句：
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1. The car's center of mass is at the back.
这辆车的重心在后部。
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2. The project aims to reduce the center of mass of the city.
该项目旨在减少城市的重心。
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3. The new design places the center of mass lower in the body.
新设计将重心降低到车身下方。