Njengezinto ezibalulekileyo, insimbi engenasici ibonise inzuzo ebalaseleyo kwiinkalo ezahlukeneyo.Ukuxhathisa kwayo kwi-corrosion, amandla aphezulu, ukumelana nobushushu obuphezulu, ucoceko, i-aesthetics, ukuphinda isetyenziswe kunye nokumelana nokunxiba kuyenza ibe yinto ekhethwa ngabantu abaninzi ...
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