Nthawi zonse, ngati madzi mu thermos akhoza kumwa pambuyo pa masiku atatu ayenera kuweruzidwa malinga ndi momwe zinthu zilili. Ngati madzi mu botolo la vacuum ndi madzi omveka bwino, ndipo chivindikirocho chimasindikizidwa mwamphamvu ndikusungidwa, akhoza kumwa pambuyo poweruza kuti mtundu, kukoma, ndi pr...
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