Mukugadzirwa kwemakurukwa edenderedzwa kwemazuva ano,sisitimu yekubvisa machirarave module inokosha inoshanda inokanganisa zvakananga kunaka kwemachira, kugadzikana kwemuchina, uye kushanda zvakanaka kwekugadzirwa kwese. Inowanzozivikanwa se "a"sisitimu yekubvisa machirakanasisitimu yekumonera jira, chikamu ichi ndicho chinoita kuti jira rakarukwa rirambe richibviswa panzvimbo yetsono uye richigadzira mipumburu yejira yakafanana. Sezvo michina yekuruka yakatenderera ichichinja ichienda pakumhanya kwakanyanya, magauge akapfava, uye maumbirwo ejira akaomarara, mashandiro ehurongwa hwekubvisa jira ari kuwedzera kutariswa muindasitiri yese.
