有凭有据 with vouchers and basis
Explanation
既有凭证，又有依据，指证据确凿，不容置疑。
Having both vouchers and basis, it means the evidence is conclusive and irrefutable.
Origin Story
话说唐朝时期，有个叫李白的诗人，他写了一首诗，题目是《望庐山瀑布》。诗中写到瀑布飞流直下三千尺，疑是银河落九天。这首诗写得非常生动形象，许多人都觉得非常赞赏。但是，有人就怀疑这首诗是不是李白真的写，于是大家开始调查。经过一番调查，终于找到了李白亲笔写的诗稿，还有当时的诗集，以及其他许多证人证言，证明这首诗确实出自李白之手。这便是有凭有据的例子。
In the Tang Dynasty, there was a poet named Li Bai, who wrote a poem titled "Looking at the Lushan Waterfall." The poem vividly depicted the waterfall cascading down three thousand feet, seeming like the Milky Way falling from the sky. Many praised the poem's vivid imagery. However, some doubted whether Li Bai had truly written it, leading to an investigation. After thorough research, they found Li Bai's original manuscript, contemporary poetry collections, and multiple witness testimonies, confirming the poem's authorship. This exemplifies "you ping you ju" – having clear evidence.
Usage
用于说明事情有确凿的证据。
Used to illustrate that something has conclusive evidence.
Examples
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警方已掌握了有凭有据的证据。
jǐngfāng yǐ zhǎngwò le yǒupíng yǒujù de zhèngjù
The police have obtained substantial evidence.
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他的说法有凭有据，令人信服。
tā de shuōfǎ yǒu píng yǒu jù, lìng rén xìnfú
His statement is well-founded and convincing.
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这份报告有凭有据，不容置疑。
zhè fèn bàogào yǒu píng yǒu jù, bùróng zhìyí
This report is well-documented and undeniable.