Dians imatha kuthandizira mitundu yonse ya zida zamakedzana, tili ndi zinthu zingapo zowonetsedwa kuti zisankhe, monga kuwonetsera njira zamankhwala, makina ogwiritsira ntchito mpweya wabwino, wovuta. Mpweya wabwino ndi nkhawa zolimbitsa thupi mpweya womwe ungakwanitse kugwiritsa ntchito. Tili pano kuti tikuthandizireni kutsimikizira zida zamankhwala.
