名词
中文翻译：Unknown
同义词：
['1. pivot point', '2.axis of rotation', '3. center of gravity']
例句：
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1.The pivot centre is the point around which the machine rotates.
支点中心是机器旋转的轴心。
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2. The axis of rotation is the line that connects the two points where the machine turns.
旋转轴是连接机器两个转动点的线。
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3.The center of gravity is the point where the weight of the object is balanced.
重心是物体重量平衡的点。