Chikho cha thermos ndi mtundu wa kapu, ngati muyika madzi otentha mmenemo, zidzatentha kwa nthawi ndithu, zomwe ndizofunikira kwambiri m'nyengo yozizira, ngakhale mutazitulutsa, mukhoza kumwa madzi otentha. Koma kwenikweni, chikho cha thermos sichikhoza kuyika madzi otentha okha, komanso madzi oundana, komanso amatha kuzizira. Beca...
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