密告人

例句：

1. 1. The police are looking for the person who is a confidant of the suspect.
   警方正在寻找嫌疑人的密友。
2. 2. She was an informant for the government during the Cold War.
   她在冷战期间为政府提供情报。
3. 3. The secret agent had to keep his activities a secret from his confidants.
   这位秘密特工不得不对他的密友保密。