溜冰是用什么方法减少摩擦的
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![溜冰是用什么方法减少摩擦的](/uploads/image/z/12973006-46-6.jpg?t=%E6%BA%9C%E5%86%B0%E6%98%AF%E7%94%A8%E4%BB%80%E4%B9%88%E6%96%B9%E6%B3%95%E5%87%8F%E5%B0%91%E6%91%A9%E6%93%A6%E7%9A%84)
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