Whenpeopleloselegsafteraccidentsorillnesses,emergencyca...
问题详情：Whenpeopleloselegsafteraccidentsorillnesses,emergencycareandartificiallimbs（假肢）oftenallowthemtowalkagain.Newts（蝾螈）inthesamesituation,ontheotherhand,cangrowlimbsbackontheirown!Scientistshavekno...