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- 問題詳情：Three-dimensionalprintersarefastbecomingeverydaydevicesintheUnitedStates.Three-Dprintersareusedtomakeeverythingfromautomobilepartstobonereplacementsforhumanpatients.Americanresearchscientistsarenowworkingoncreatingreplacementsforlivingtissue....
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