Chidziwitso Chachidule Valavu yowongolera ndi gawo lowongolera mumayendedwe otumizira madzimadzi, omwe ali ndi ntchito zodula, kuwongolera, kusokoneza, kupewa kubweza, kukhazikika kwamagetsi, kupatukana kapena kusefukira komanso kutulutsa mphamvu. Ma valve kuwongolera mafakitale amagwiritsidwa ntchito kwambiri pakuwongolera njira mu ind ...
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