M'gawo la zomatira lomwe likusintha nthawi zonse, kufunafuna zomatira zabwino kwachititsa kuti pakhale kuchuluka kwa utomoni wa hydrogenated hydrocarbon. Odziwika chifukwa cha kukhazikika kwawo kwamafuta komanso kuyanjana ndi ma polima osiyanasiyana, ma resin awa akhala chinthu chofunikira kwambiri mu ...