Caadi ahaan loo isticmaalo wax-soo-saarka ama cilmi-baarista sayniska, qolka nadiifka ah waa deegaan la xakameeyey oo leh heer hoose oo wasakh ah sida boodhka, microbes hawo-mareenka, walxaha aerosol-ka, iyo uumiga kiimikada.Si sax ah, qol nadiif ah ayaa leh ...
Akhri wax dheeraad ah