We have no firm evidence to support the case.

我们没有确凿的证据支持这个论点。

《牛津词典》

This man may have killed others but unfortunately we have no firm evidence.

这名男子可能还杀过别的人，只可惜我们没有确凿的证据。

《柯林斯英汉双解大词典》

‘You’d think it was based on firm evidence of health benefit. Think again!

如果你认为有充足的证据来证实此建议有益身体健康，那么你就又错了！

youdao

"There is firm evidence that certain foreign quarters are behind such assassinations, " the letter said.

CNN: SHARE THIS

Traditionally, drug tests often require firm evidence that patients, say, live or die necessarily quite a lengthy process.

ECONOMIST: Face value

To accuse the Chinese military of launching cyberattacks without firm evidence is not professional and also groundless.

WSJ: New York Times Says Chinese Hacked Paper's Computers