n. a person who supplies information
n. 提供消息者, 密告者, 被调查者
[经] 填报人, 被征询人
1. The police used an informant to gather information about the suspect.
警方利用一名线人收集关于嫌疑犯的信息。
2. She decided to become an informant to help bring the criminals to justice.
她决定成为一名线人，以帮助将罪犯绳之以法。
3. The informant provided crucial evidence that led to the arrest.
这名线人提供了关键证据，导致了逮捕。