geographical rotation

基本解释

The Council is composed of thirty-four Member States of the United Nations Educational, Scientific and Cultural Organization, elected by the General Conference at its ordinary sessions, taking due account of equitable geographical distribution, of the need to ensure appropriate rotation, of the representativeness of these States from the ecological viewpoint in the various continents, and of the importance of their scientific contribution to the international MAB programme.
UNESCO: Detailview United Nations Educational, Scientific and Cultural Organization