你的断言是否有真凭实据？

Do you have any evidence to support your assertions?

《牛津词典》

你也许认为这样强硬的断言有真凭实据作为支撑，但是事实上，证据是模糊的。

You would assume that such strong claims were backed by solid proof, but the evidence is, in fact, mixed.

youdao

保护商业应表现于游击队的严格的纪律上面；除了有真凭实据的汉奸之外，决不准乱没收一家商店。

The protection of commerce means that the guerrilla units should be highly disciplined and that the confiscation of shops, except those owned by proved traitors, should be strictly prohibited.

youdao