Theories derive from practice as well as guide them, especially in the economic field. Therefore, the third method is substantial proof combining theories with practice.

理论来源于实践又必将指导实践，尤其在经济领域更是如此，因此，理论联系实践的实证分析法是本文的第三种研究方法。

youdao

And no court and no prosecutor would accept the notion that such statements standing alone satisfy the requirement of substantial corroborative proof when there is a swearing bash.

CNN

First, this is a classic oath on oath, he-says-she-says swearing match, that under ordinary custom and practice at the Department of Justice never would be prosecuted without substantial corroborative proof.

CNN

Furthermore, because perjury and obstruction charges often arise from private dealings with few observers, the courts have required either two witnesses who testify directly to the facts establishing the crime, or if only one witness testifies to the facts constituting the alleged perjury, that there be substantial corroborating proof to establish guilt.

CNN