现代的轮式旱冰鞋一般有双排轮和单排轮两种，在速度上都比以前大有提高。
Modern wheeled roller skates usually have a double row wheel and odd round two kinds, in speed greatly improved than before.
现代的轮式旱冰鞋一般有双排轮和单排轮两种，在速度上都比以前大有提高。
Modern wheeled roller skates usually have a double row wheel and odd round two kinds, in speed greatly improved than before.
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