Todayrollerskatingis的精选

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