Umuyoboro w'icyuma udafite icyerekezo gifite umwanya w'ingenzi mu iyubakwa, hamwe n’ihindagurika rikomeje ry’uburyo bwo gutunganya, ubu rikoreshwa cyane muri peteroli, imiti, sitasiyo y’amashanyarazi, ubwato, gukora imashini, imodoka, indege, indege, ikirere, ingufu, geologiya n’ubwubatsi n’izindi nzego. ...
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