n.(向警方或其他当局的)告密者，线人

原形：informer复数：informers

The informer disclosed the location of the secret meeting to the police.
举报人向警方透露了秘密会议的地点。
He was arrested as an informer after betraying his comrades to the authorities.
他因向当局出卖同志而被捕，成为了一名告密者。
The journalist acted as an informer, leaking inside information about the corporation's wrongdoings.
记者充当了线人的角色，泄露了公司不法行为的内部信息。
The police offered a reward for anyone who could act as an informer on the criminal's whereabouts.
警方悬赏给能提供罪犯行踪信息的举报人。
She became an informer to protect her family from the gang's retaliation.
为了保护家人免受黑帮报复，她成了一个告密者。
The informer's testimony was crucial in dismantling the drug trafficking ring.
举报人的证词对于摧毁贩毒团伙至关重要。
Despite the risks, he bravely decided to be an informer and expose the corruption within the department.
尽管有风险，他还是勇敢地决定成为一名举报人，揭露部门内的腐败现象。
As an informer, he lived under constant fear of being discovered by the mafia.
作为告密者，他一直生活在被黑手党发现的恐惧中。
The identity of the informer was kept anonymous to ensure their safety.
为了确保安全，举报人的身份被保密。
His role as an informer for the intelligence agency was only revealed after his death.
他作为情报机构线人的身份直到他去世后才被揭露。