名词
中文翻译：轴心
同义词：
['pivot', 'axis', 'core']
例句：
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1.The axle of the wheel is where the wheels turn.
车轮的轴是车轮转动的地方。
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2. The center of gravity is the point where the weight balances.
重心是重量平衡的地方。
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3. The axis of symmetry is the line that divides two parts of an object.
对称轴是分割物体两部分的线。