Whatishappiness?Therearedifferentopinionsaboutthat.Somepeoplethinkitishappiesttobewithfamiliesandtocommunicatewithfriends.Somethinkthatyouwillbehappyifyouareoptimistictothelifeand(ifyouare)devotedtoyourcareer.Othersthinkthathappiesmeansyoualwaysmakenewachievements.Inmyopinion,Itishappiesttolivesafelyinone'slife.(不是原创)