- 问题详情:Today,rollerskatingiseasyandfun.Butmanyyearsago,itwasn'teasyatall.Before1750,peoplenevertriedskatingonwheels.ThatchangedbecauseofamannamedJosephMerlin.Merlin'sworkwasmakinginstruments.Inhisfreetimehelikedtoplaytheviolin.Merlinwasamanwithman...
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