Ivalve sisixhobo sokulawula ukuhamba, uxinzelelo, kunye necala lolwelo. Ulwelo olulawulwayo lusenokuba lulwelo, irhasi, umxube werhasi-ulwelo, okanye umxube wolwelo oluqinileyo. I-valve idla ngomzimba wevalvu, isigqubuthelo, isihlalo, iziqwenga ezivulekileyo nezivaliweyo, indlela yokuqhuba, izitywina kunye neziqhoboshi, njalo njalo. I...
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