COMB in ADJ [ADJ n] （构成形容词）表示“排名…的” -ranking is used to form adjectives which indicate what rank someone has in an organization. （构成形容词）表示“排名…的”
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...a colonel on trial with three lower-ranking officers.
一位正在同3名低级别官员一同受审的陆军上校
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He was the third-ranking official of the CIA from 1984 to 1987.
从1984到1987年，他一直是中央情报局的三把手。