英语连词前面的逗号有什么用?.,and.举个例子：1Childrenwillplaywithdollsequippedwithpersonalitychips,computerswithin-builtpersonalitieswillberegardedasworkmatesratherthantools,relaxationwillbeinfrontofsmell-te

　　英语连词前面的逗号有什么用?.,and.

　　举个例子：

　　1Childrenwillplaywithdollsequippedwithpersonalitychips,computerswithin-builtpersonalitieswillberegardedasworkmatesratherthantools,relaxationwillbeinfrontofsmell-television,anddigitalagewillhavearrived.

　　2.InEurope,aselsewhere,multi-mediagroupshavebeenincreasinglysuccessful:groupswhichbringtogethertelevision,radionewspapers,magazinesandpublishinghousesthatworkinrelationtooneanother.

　　1.中的.......anddigital中的magazinesandpublishing有什么区别？和区别的窍门？