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Almosteverymachinewithmovingpartshaswheels,yetnooneknow...

  • Almosteverymachinewithmovingpartshaswheels,yetnooneknow...

  • 问题详情：Almosteverymachinewithmovingpartshaswheels,yetnooneknowsexactlywhenthefirstwheelwasinventedorwhatitwasusedfor.Wedoknow,however,thattheyexistedover5,500yearsagoinancientAsia.    Theoldestknowntransportwheelwasdiscoveredin2002inSlovenia.Iti...
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