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- 问题详情：Ifyourpenbrokeatschooltoday,whatwouldyoudo?Youwouldgotoashopandbuyanewone.Whatifyoucouldsimplyprintoutareal,workingpenwithyour3-Dprinterwithoutleavingyourroom? Tenyearsagopeoplecouldonlysee3-Dprintinginsciencefictionmovies.Butnow3-Dprint...
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