counter-espionage
noun [ U ] uk/ˌkaʊn.tərˈes.pi.ə.nɑːʒ/ us/ˌkaʊn.t̬ɚˈes.pi.ə.nɑːʒ/
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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