Valavu ndi chipangizo chamakina chomwe chimayang'anira kuyenda, kuyenda, kuthamanga, kutentha, ndi zina zotero za sing'anga yamadzimadzi, ndi valavu ndi gawo lofunikira mu dongosolo la mapaipi. Zopangira ma valve ndizofanana mwaukadaulo monga mapampu ndipo nthawi zambiri amakambidwa ngati gulu losiyana. Ndiye mitundu yanji...
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