Iivalvu ezininzi eziqhelekileyo ezisetyenziswa kwimibhobho yemizi-mveliso, iivalvu zebhola zezona zisetyenziswa kakhulu, nokuba yimibhobho eqhelekileyo yamanzi, i-oyile negesi okanye iimeko ezirhabaxa zokusebenza eziqulathe amasuntswana anobulukhuni obuphezulu, nokuba bubushushu obuphantsi, ubushushu obuphezulu, okanye indawo eyonakalisayo. , wena...
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