 Dib u habaynta hayadaha nabad-galyadu waa u muhiim waddamada ka soo gudbay marxaladda dagaalada iyo colaadda, maxaa yeelay waxa ay ka taageeraysaa sidii hayadaha hirgaliya ku dhaqanka sharcigau noqon lahaayeen kuwo leh isla-xisaabtan hufan oo sax ah. 