M'zaka zaposachedwa, ndi chitukuko chosalekeza cha Sci. & Tech, kuweta kwa ziweto zachikhalidwe kwabweretsanso njira yatsopano. Mwachitsanzo, masensa osiyanasiyana amaikidwa pafamu ya ziweto kuti aziyang'anira mpweya wa ammonia, chinyezi, kutentha ndi chinyezi, kuwala, zinthu ...
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