informer [ɪnˈfɔ:rmə(r)]

例句:

• Jan Molka is a Solidarity activist who turned informer.
  来自BBC
• Prentice saw Goss fall in behind the informer.
  普伦蒂斯看见戈斯走在密探身后。
  
• The police provided a safe house for the informer.
  警方给线人提供了一个安全屋.
  
• One of the gang members had turned informer.
  团夥中的一员后来变成了告密者.
  
• In reality, he had become an informer for the police.
  来自NEWYORKER
• The one about him being an informer could get him killed.
  来自NEWYORKER