但这个由两名中国教授和一名伦敦研究学者所做的调查研究提供了关于性别失调的程度及其造成原因的第一手硬资料。
But the study, by two Chinese university professors and a London researcher, provides some of the first hard data on the extent of the disparity and the factors contributing to it.
通过深入的调查研究，他们终于取得了大量的第一手资料。
Through and intensive investigation they have finally obtained abundant first-hand information.
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。
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.
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