D? ka nhazi ihe onwunwe si d?, enwere ike kewaa osisi ah? ?z? ab??: osisi siri ike na osisi artificial; d? ka nhazi nhazi ah? si d?, enwere ike kewaa ya n'ime osisi siri ike, plywood, fiberboard, panel, fireboard na na. Kedu ?d? ihe eji ar? ?l?, yana...
G?KWUO