counterintelligence
noun [ U ] uk/ˌkaʊn.tər.ɪnˈtel.ɪ.dʒəns/ us/ˌkaʊn.t̬ɚ.ɪnˈtel.ə.dʒəns/
反情报秘密行动,反间谍活动
secret action taken by a country to prevent another country from discovering its military, industrial, or political secrets
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