Izingwegwe zensimbi engagqwali zinezinhlobonhlobo zezicelo ezimbonini ezahlukahlukene kanye nezilungiselelo zasendlini.Zenziwe ngensimbi engagqwali yeqophelo eliphezulu, ezenza ziqine, zingagqwali, futhi zikwazi ukumelana namazinga okushisa aphezulu, okuzenza zifaneleke kokubili ukusetshenziswa endlini nangaphandle.