名词
中文翻译：关节支点中心
同义词：
['knuckle', 'pivot point', 'center of gravity']
例句：
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1.The engineer carefully adjusted the knuckle pivot center to ensure stability.
工程师小心翼翼地调整了关节支点中心，以确保稳定性。
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2.The pivot center is the point where the weight of the object is balanced.
支点是物体重量平衡的点。
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3.The center of gravity is the point at which an object is balanced on a surface.
重心是物体在表面上平衡的点。