counter-espionage

noun

1. 反间谍活动
   secret action taken by a country to prevent an enemy country from finding out its secrets

1. They posted the letters to their handlers, hoping that counter-espionage experts would be fooled by the seemingly innocent pictures.
   间谍将藏有机密的信件送到邮局，他们希望这些看上去毫无意义的图案能骗过盟军的眼睛。
2. Counter-espionage and security work were to occupy most of Walter's time for the next four years.
   和间谍遭遇战以及秘密工作占据了沃特随后四年的大部分时间。
3. Operate the anti-virus software or counter-espionage software scanning, once find some unusual projects are removed immediately.
   运行防病毒软件或反间谍软件扫描，一旦发现一些异常的项目立即清除。
4. Espionage undertaken to detect and counteract enemy espionage. a Bureau that runs espionage operations. counter-espionage activities
   反间谍活动对发现和阻碍敌人间谍活动而进行的间谍活动
5. As the war went on, counter-espionage officials developed ways of spotting suspicious letters.
   随著战事推进，英国反间谍工作人员总结出了许多破解可疑信件的方式。