Whenpeopleloselegsafteraccidentsorillnesses,emergencyca...
問題詳情：Whenpeopleloselegsafteraccidentsorillnesses,emergencycareandartificiallimbs（假肢）oftenallowthemtowalkagain.Newts（蠑螈）inthesamesituation,ontheotherhand,cangrowlimbsbackontheirown!Scientistshavekno...