轮
轮是以圆形个物体造成，可以绕着轴心转动。透过滚动，大为减少磨擦。如果配上轴，即成为车个最主要构成部分。轮拉交通运输中非常有用，是人类个重要发明之一。除了车轮以外，其他圆形个轮还有舵轮、飞轮等等。
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