From professional translators, enterprises, web pages and freely available translation repositories.
it requires shielding and containment and is encased in concrete , stored in steel drums and housed above ground at existing nuclear sites
rhaid ei warchod a'i reoli ac fe'i caeir mewn concrit , ei storio mewn barilau dur a'i gadw uwchlaw'r ddaear mewn safleoedd niwclear sydd yn bodoli eisoes
