n.(向警方或报纸)提供消息的人，告密者，线人，(为研究等)提供资料的人，合作者

原形：informant复数：informants

We suspected that he was the informant.
我们怀疑他是告密者。
Being an informant makes him feel regretful.
他后悔当了告密者。
Eric has informants everywhere.
到处都有埃里克的眼线。
The police were able to make the arrest thanks to an informant's tip.
警方根据线人提供的线索得以实施逮捕。
The informant's identity is being kept anonymous to ensure their safety.
为了确保线人的安全，其身份被保密。
He became an informant for the FBI in exchange for immunity from prosecution.
他成为FBI的线人，以换取免于起诉的豁免权。
The journalist relied on a confidential informant to expose the corruption scandal.
这位记者依靠一名秘密线人揭露了腐败丑闻。
The informant's information led to the recovery of stolen property.
线人提供的情报帮助找回了被盗财物。
She was hesitant to become an informant, fearing retaliation from her former associates.
她犹豫要不要成为线人，担心会遭到以前同伙的报复。
The police have a network of informants who provide them with valuable intelligence.
警方有一个线人网络，为他们提供宝贵的情报。
His role as an informant was discovered, putting his life at great risk.
他作为线人的身份被发现，使他的生命处于极大危险之中。
The trial relied heavily on the testimony of a key informant.
审判在很大程度上依赖于关键线人的证词。
The informant's cooperation was instrumental in dismantling the criminal organization.
线人的合作对于摧毁犯罪组织起到了关键作用。