Gawo lowongolera la makina owotcherera apakati pafupipafupi amatengera zida zapadera zomwe zimagunda pang'ono, ndipo valavu yamagetsi imalumikizidwa mwachindunji ndi silinda, kufulumizitsa nthawi yoyankha, kupititsa patsogolo liwiro la kuwotcherera, ndikuchepetsa kutayika kwa mpweya, zomwe zimapangitsa ntchito yayitali...
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