The chairperson of an international organization, who represents an Olympic sport (e.g. the chairman of the athletics IAAF), is represented in the IOC "ex officio" (i.e., because of that position).
代表某一奥林匹克运动的国际组织的主席（如田径运动IAAF主席），在IOC内作为“ex officio”（即“依据职权”）代表。