1660s, "someone or something that supplies information," from Latin informantem (nominative informans), present participle of informare (see inform). Meaning "one who gives information to the authorities, informer" is from 1783. As an adjective from 1890. The older noun was informer.
权威例句
1. 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.
2. 'Old Bailey spy ,'returned his informant.
“ 老贝勒的密探, ” 他的情报提供人说,“呀哈!
3. The informant is expected to provide the information about the deceased.
希望义务报告人提供关于死者的情况.
4. The sound of our informant's voice directed him to the library.
向我们报告的人的声音把他引到书房来.
5. The " report " could only have come from Shishayev, who obviously was Pronnikov's informant.