Counterintelligence is the work a country does to stop other countries — or enemy groups — from stealing its secrets. Intelligence here means secret information and the people who hunt for it, not “being clever.” So counterintelligence is the shield: catching spies, feeding them false stories, watching who is asking too many questions, protecting codes and plans.

Counterintelligence反情報 is the work a country does是一個國家用來 to stop other countries — or enemy groups — from stealing its secrets阻止其他國家或敵對組織偷走自己機密的工作。 Intelligence here這裡的intelligence means secret information and the people who hunt for it指的是機密情報，以及蒐集情報的人, not "being clever."不是「聰明」的意思。 So counterintelligence is the shield所以counterintelligence就是那面盾牌：catching spies抓間諜, feeding them false stories餵假消息給他們, watching who is asking too many questions留意誰問太多問題, protecting codes and plans保護密碼和計畫。

You hear it in government, military, and spy stories. It is formal.

You hear it你會在這些地方聽到它 in government, military, and spy stories政府、軍事，還有間諜故事裡。 It它 is formal是個正式用語。

Though actually, films make it look like one genius in a dark room; in real life it is slow checking, rules, and a lot of paper. It is close to counterespionage, but counterintelligence is the broader office word for defending your secrets.

Though actually不過事實上, films make it look like one genius in a dark room電影把它拍得像是一個天才在暗房裡辦案; in real life而現實生活裡它其實是 it is slow checking, rules, and a lot of paper緩慢的查核、規定，還有一大堆文書作業。 It它 is close to counterespionage跟counterespionage（反間諜）很接近, but counterintelligence is the broader office word for defending your secrets但counterintelligence是機構裡用來統稱「保護自己機密」比較廣的說法。