 Qoraalka sawirka, Birtii goolka oo sii dumeysa Hadda hawsha ugu horeysa waa in laga jaraa geedaha iyo cawska ka baxay, balse waxaa hubanti ah in garoonka u baahanyahay dayactir balaaran, iyada oo xitaa lagama maarmaan ay noqon doonto in ay injineero hubiyaan in dhismaha meelaha qaar garoonka uu ku habboonyahay in biniaadam ay isticmaalaan iyo in kale. 