informant

名词 informant:

1. a person who supplies information
   同义词：source
2. someone who sees an event and reports what happened
   同义词：witness, witnesser

1. Police hurried to the address supplied by their informant, only to learn that their bird had flown less than an hour before.
   警察急忙赶到告密者提供的地址处，只获悉他们要捉的人一小时不到前已逃走了。
2. A person, especially an informant, who communicates something.
   传递信息的人传达某事的人，尤指密告者
3. The journalist did not want to reveal the identity of his informant.
   那个新闻工作者不想透露消息提供人的身分。