Todayroller-skatingiseasyandfunny.Butalongtimeago,itwa...
问题详情: Todayroller-skatingiseasyandfunny.Butalongtimeago,itwasn'teasyatall.Before1760,theideaof61.________(skate)didn'texist.Thatwaschangedbecause62._______amannamedJosephMerlin.Merlin'sworkwasmak...