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Greatinventionschangethewaywelive,Thefirstgreatinventio...
问题详情:Greatinventionschangethewaywelive,Thefirstgreatinventionwasonethatisstillveryimportanttoday—thewheel.Thismade_ 61 easyformentocarryheavythingsandtotravellongdistances.For _62(century)afterth...