Chilema chimodzi: Simungathe kuthira Zinthu: mawonekedwe oponyera sakwanira, m'mphepete mwake ndi ngodya zake ndi zozungulira, zomwe nthawi zambiri zimawoneka m'zigawo zopyapyala za khoma. Zifukwa: 1. Chitsulo chamadzimadzi okosijeni ndi chachikulu, mpweya wa carbon ndi silicon ndi wotsika, sulfure wokhutira ndi wochuluka; 2. Low kuthira kutentha, pang'onopang'ono kuthira liwiro...
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