Chifukwa cha ntchito yosindikiza ya kusokoneza ndi kulumikiza, kuwongolera ndi kugawa, kulekanitsa ndi kusakaniza zofalitsa mu valvpassage, malo osindikizira nthawi zambiri amakhala ndi dzimbiri, kukokoloka, ndi kuvala ndi atolankhani, zomwe zimapangitsa kuti ziwonongeke kwambiri. Mawu Ofunika Kwambiri: Se...
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