Languageshavebeencomingandgoingforthousandsofyears,buti...
問題詳情：Languageshavebeencomingandgoingforthousandsofyears,butinrecenttimestherehasbeenlesscomingandalotmoregoing.Whentheworldwasstillpopulatedbyhunter-gatherers,small,tightlyknit(聯繫)groupsdeveloped...