The report is underpinned by extensive research.

这份报告以广泛的研究为基础。

《牛津词典》

Extensive research has been done into this disease.

对这种疾病已进行了广泛研究。

《牛津词典》

He has carried out extensive research into renewable energy sources.

他已经对再生能源进行了广泛研究。

《牛津词典》

The screenplay for "The King's Speech" was based on extensive research and personal writings.

VOA: special.2010.12.13

However, extensive research by serious scholars has failed to unearth the text of this religious guidance.

FORBES: Some Unanswered Questions On Iran

Extensive research has failed to uncover even a single reference by Obama to Alinsky.

FORBES: Dear President Obama: You're No Saul Alinsky

But we have now concluded, after extensive research, that these cases regarding fees are well-founded.

FORBES: An Extreme Makeover Due For Defined Contribution Plans: 401(k), 403(b) and 457s All Under Attack (June 1, 2007)