Pantchito yomanga, migodi, ndi kukumba miyala, makina ophwanyira amathandizira kwambiri kuchepetsa miyala ndi mchere kuti zikhale zophatikizika. Komabe, makina amphamvuwa, monga chida china chilichonse, amatha kukumana ndi zovuta zosiyanasiyana zomwe zimalepheretsa magwiridwe antchito awo komanso kupanga kwawo. Izi...
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