Ama-valve amaningana avamile asetshenziswa kumapayipi ezimboni, ama-valve amabhola yiwona asetshenziswa kakhulu, kungakhathaliseki ukuthi amapayipi avamile aphakathi nendawo amanzi, uwoyela negesi noma izimo zokusebenza ezinzima eziqukethe izinhlayiya ezinobulukhuni obukhulu, kungakhathaliseki ukuthi izinga lokushisa eliphansi, izinga lokushisa eliphezulu, noma imvelo ebolayo. , wena...
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