This can be done through informal conversations or by asking employees to fill out an anonymous questionnaire.

这可以通过非正式的谈话进行，也可以通过请员工填写匿名问答卷来收集。

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Methods: an anonymous questionnaire survey was conducted among 560 college students through Internet.

方法：本课题通过网络采用无记名方式问卷调查了560名大学生。

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Methods: an anonymous questionnaire survey was completed among 2816 students from 8 schools in Yibin.

方法：对宜宾市8所中学内共2816名中学生进行问卷调查。

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Even so, in a recent survey done at the University of Chicago Medical Center, 45 percent of internists who filled out the anonymous questionnaire said they had used a placebo at some time during their clinical practice.

CNN: Doctors admit prescribing placebos

To describe the prevalence of binge drinking, the CDC analyzed data from its 2011 Behavioral Risk Factor Surveillance System, an annual telephone survey, and the national 2011 Youth Risk Behavior Survey, an anonymous questionnaire completed by high school students nationwide.

CNN: CDC: 1 in 5 high school girls binge drink

He penned a special note on the front page of the questionnaire warning the judge and attorneys that it will be impossible for him to remain anonymous because NBC employees who report to him will be in the courtroom covering the trial.

CNN: Spector murder trial: Jury familiar with guns, drugs, celebrities