He wanted more hard evidence.

他想要更多确凿的证据。

Is there any hard evidence either way?

不管正反，有什么确凿证据吗？

Blackett was almost the first to obtain hard evidence.

布莱克特几乎是第一个发现有力证据的人。

There's no hard evidence of it.

目前没有过硬的证据。

We need some hard evidence to support our claim.

我们需要一些确凿的证据来支持我们的主张。