英语翻译Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.attheturnofthecenturywhenjazzwasborn,Americahadnoprominent（突击的）musicoftisown.Nooneknowsexactlywhenjazzwasinvented,orbywhom.Butitbegan

　　英语翻译

　　Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.attheturnofthecenturywhenjazzwasborn,Americahadnoprominent（突击的）musicoftisown.Nooneknowsexactlywhenjazzwasinvented,orbywhom.Butitbegantobenoticedintheearly1900s.JazzisAmerica’scontributiontopopularmusic.Incontrasttoclassicalmusic,whichfollowsfromalEuropeantraditions,jazzisspontaneous（自发的,自然产生的）anditsformisfree.Itbubbles（涌动）withenergy,expressingmoods,interestsandemotionsofthepeople.Inthe1920s,jazzsoundedlikeAmerica.Andsoitdoestoday.

　　重点说说attheturnof是不是短语.