NSEN elu arụmọrụ urukurubụba valvụ na-etinyere n'ọtụtụ ebe na chemical usoro, mmiri, ike osisi wdg na adabara elu okpomọkụ, nwere ogologo ọrụ ndụ , tụnyere concentric urukurubụba valvụ.
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