6: የአካባቢ ተስማሚ ቦርድ ተከታታይ ሙሉ በሙሉ በነፃ መርዛማ ፋይበር, ምንም መርዝ, ምንም-መርዛማ ጨረር ናቸው.
6: Environmental lobuhlobo ibhodi Series ngokupheleleyo ngokukhululekileyo of ifayibha enobuhlungu, akukho ityhefu, imitha no-ityhefu.