linguafranca
【正确答案】：Alinguafrancaisavarietyoflanguagethatservesasamediumofcommunicationamonggroupsofpeoplefordiverselinguisticbackgrounds.Alinguafrancamustbeanagree?upon“commontongue”usedbypeoplethrowninsocialcontactforvariouspurposes.Forexample,thespokenlanguageofmodernChina普通话,knownasthe“commonspeech”,servesasaneffectivelinguafrancaamongspeakersof56differentnationalities.Englishisaninternationallinguafranca,usedinnumeroussocialandpoliticalsituationswhereacommonlanguageisaskedfor.