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Definition: Ei heisiau arnoch chi os ydych chi'n symud anifeiliaid o ardal ddi-glefyd i ardal ddi-glefyd arall ond eich bod chi'n gorfod pasio trwy (ac aros mewn) ardal â statws iechyd arall e.e. Ardal Dim Allforio neu Ardal Cyfyngiadau Allforio..