Kuthamanga kwamtundu kumatanthawuza kuchuluka kwa nsalu zotayidwa pansi pa zochitika zakunja (extrusion, kukangana, kutsuka, mvula, kuwonekera, kuwala, kumiza m'madzi a m'nyanja, kumizidwa ndi malovu, madontho a m'madzi, madontho a thukuta, etc.) panthawi yogwiritsira ntchito kapena kukonza.Imayesa kufulumira kutengera discolorat ...
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