Data SOURCES: All the data came from the first-hand materials and results of questionnaire investigation in the writer's experience in the psychological education of college students.

资料来源：作者本人在大学生心理辅导工作中获得的第一手材料及问卷调查结果。

youdao

A field survey approach was applied for this research, the first-hand information by investigation on Jingxing mining area of Shijiazhuang was used as the data sources.

采用实地调查的方法，以石家庄市井陉矿区调查的一手资料为数据来源进行研究。

youdao

The CIA, MI6 and other agencies had a poor reading of threats because they had too few first-hand sources in the region.

ECONOMIST: Spymasters or spinmeisters? | The

Coteries of reporters aggressively pursued information in the form of first hand accounts, sources, rumors and speculation.

FORBES: Fond Reflections On The Winter Meetings