Leon,12,wasbornwithoutfingersonhislefthand.Thatdidn'...
问题详情： Leon,12,wasbornwithoutfingersonhisleftdidn't-stophimfrombeingabletodomanytasks.ButLeoncouldnotgraspmorethanoneobjectatatime.SoLeon'sfather,Paul,createdaprosthesis(假肢），usinga3Dprinter.N...