单词	roller skate
释义	roller skate /ˈrəʊləskeɪt / noun Each of a pair of boots or metal frames fitted to shoes with four or more small wheels, for gliding across a hard surface.The four wheels and the metal plate on a roller skate are much heavier than the single blade on an ice skate.... The softboot skates feel more like a hiking boot than a roller skate. He came up with a four-wheel skate with two pairs of wheels side by side, and so the modern four-wheel roller skate was created.
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