Ibyuma bishyirwa mubyuma bivanze, bikozwe mubindi bikoresho bya shimi nka fer na karubone.Bitewe n'imbaraga zayo zikomeye hamwe nigiciro gito, ibyuma bikoreshwa cyane muburyo butandukanye mugihe cyiki gihe, nko gukorwa mu miyoboro yicyuma kare, ibyuma byurukiramende pi ...
Soma byinshi