名词
中文翻译：轮心
同义词：
['hub', 'axle center', 'pivot']
例句：
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1.The wheel center of the car is where the wheels turn.
汽车的轮心是车轮转动的地方。
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2. The axle center of the train is where the wheels are connected to the rails.
火车的轴心是车轮与铁轨连接的地方。
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3.The pivot of the machine is where the weight is balanced.
机器的枢轴是重量平衡的地方。