他们提供的证据是确凿无疑的。

The evidence they provided was ___undeniable.

不可否认的是，这位科学家为我们的国家做出了巨大贡献。

It is ___undeniable that this scientist has made a huge contribution to our country.

人类活动与气候变化之间的关联现在是不可否认的。

The link between human activity and climate change is now ___undeniable.