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Almosteverymachinewithmovingpartshaswheels,yetnooneknow...
問題詳情:Almosteverymachinewithmovingpartshaswheels,yetnooneknowsexactlywhenthefirstwheelwasinventedorwhatitwasusedfor.Wedoknow,however,thattheyexistedover5,500yearsagoinancientAsia. Theoldestkn...