informant

n.

提供消息的人；告密者；被调查者；报告者

复数：informants

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. 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。
3. Could you be my language informant for Dutch?
   你愿意为我作荷兰语的资料提供人吗?

Cognitive structure and informant accuracy.
The AD8 A brief informant interview to detect dementia
The Problem of Informant Accuracy: The Validity of Retrospective Data
Purposive Sampling as a Tool for Informant Selection
Higher-order factors of the Big Five in a multi-informant sample
Very mild Alzheimer's disease: Informant-based clinical, psychometric, and pathologic distinction from normal aging
Assessing Measurement Error in Key Informant Reports: A Methodological Note on Organizational Analysis in Marketing
Informant discrepancies in the assessment of childhood psychopathology: a critical review, theoretical framework, and recommendation...
Six-year predictors of problems in a national sample of children and youth: I. Cross-informant syndromes.
Child/adolescent behavioral and emotional problems: implications of cross-informant correlations for situational specificity.