1.Theoccurrenceofsomethingthatisencounteredfrequentlyisoftenreferredtoasa"commonphenomenon"inEnglish.2.Whendescribingsomethingthathappensoften,youcansayitisa"frequentoccurrence"ora"regularfeature."3.Ifyouwanttoexpressthatsomethingiswidespreadandhappensacrossvarioussituations,youmightsayitisa"pervasivephenomenon."4.Theterm"ubiquitous"canalsobeusedtodescribesomethingthatis普遍存在于许多地方orhappensconstantly.5.Forsomethingthatisnotonlycommonbutalsogenerallyacceptedasnormal,youcanusethephrase"anormativephenomenon."