Iyini iValvu Yesango? Incazelo, Isakhiwo, Izinhlobo, kanye Nokuqonda Kwabahlinzeki Isingeniso Ivalvu yesango iyisici esibalulekile ezinhlelweni zamapayipi ezimboni, eklanyelwe ukulawula ukugeleza koketshezi. Njengoba isetshenziswa kabanzi ekuhlinzekweni kwamanzi, uwoyela negesi, kanye nezimboni zamakhemikhali, amavalvu esango aziwa ngokuthembela kwawo...
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