Asweknow,DNAtestingisveryusefulforcrimefighting.Butnowc...
问题详情：Asweknow,DNAtestingisveryusefulforcrimefighting.Butnowcrimefighterscouldhaveanewtoolathand.Researchershavedevelopedacutting-edge(前沿的)techniquetoidentifyhumanhair.TheirtestisquickerthanDNAan...