Umuyoboro utangaje wo kuboha ibyuma birahinduka kandi bikoreshwa cyane mumirima itandukanye bitewe no kwangirika kwabo, imbaraga, no koroshya guhuza. Bavumbuye porogaramu muri sisitemu y'amazi, ubwubatsi n'imiterere, gukoresha inganda, imiterere y'ubuhinzi, ho ...
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