Uwe mkpuchi atọ na-ezo aka na akwa nkịtị nke a na-enweta ọgwụgwọ elu pụrụ iche, na-ejikarị fluorocarbon waterproofing agents, iji mepụta oyi akwa nke ihe nkiri nchebe nke ikuku na-ekpuchi elu, na-arụ ọrụ nke mgbochi mmiri, ihe mkpuchi mmanụ, na mgbochi. Ma ọ bụ...
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