候補(bǔ)
be a candidate (for a vacancy);alternate;incoming;earmarked
中共中央政治局～委員alternate member of the Political Bureau of the Central Committee of the Communist Party of China /駐聯(lián)合國(guó)安理會(huì)～代表alternate representative of…on the Security Council of the United Nations/～隊(duì)員substitute/～董事alternate director/～書記alternate secretary